芒果视频下载

云霧山(shan)自然保(bao)護區(qu)(qu)（Yunwushan Nature Re-Serve） 中國(guo)第2個(ge)(ge)草(cao)原(yuan)(yuan)保(bao)護區(qu)(qu)。屬黃(huang)(huang)土(tu)(tu)高原(yuan)(yuan)長(chang)芒(mang)草(cao)群系(xi)(xi)保(bao)留較好的(de)(de)典型地區(qu)(qu)，對開展草(cao)原(yuan)(yuan)生(sheng)(sheng)態系(xi)(xi)統的(de)(de)定位研究，探索草(cao)原(yuan)(yuan)、畜牧(mu)、水土(tu)(tu)保(bao)持(chi)間的(de)(de)關系(xi)(xi)有(you)重要科研價(jia)值。位于寧夏(xia)固原(yuan)(yuan)縣東北，為(wei)中溫帶半干旱黃(huang)(huang)土(tu)(tu)丘陵低山(shan)區(qu)(qu)。已劃定自然保(bao)護區(qu)(qu)面積1300公頃。海拔多(duo)在(zai)1800～1900米(mi)，頂峰(feng)2148米(mi)。年(nian)均溫6℃，年(nian)降水量約350～400毫米(mi)，土(tu)(tu)壤主要為(wei)淡黑(hei)壚土(tu)(tu)。有(you)種(zhong)(zhong)子植(zhi)(zhi)(zhi)物(wu)(wu)(wu)181種(zhong)(zhong)，其中草(cao)本植(zhi)(zhi)(zhi)物(wu)(wu)(wu)140多(duo)種(zhong)(zhong)，包括飼用植(zhi)(zhi)(zhi)物(wu)(wu)(wu)110種(zhong)(zhong)，藥(yao)用植(zhi)(zhi)(zhi)物(wu)(wu)(wu)41種(zhong)(zhong)；脊椎動物(wu)(wu)(wu)80種(zhong)(zhong)。共有(you)典型草(cao)原(yuan)(yuan)、草(cao)甸草(cao)原(yuan)(yuan)、荒(huang)漠草(cao)原(yuan)(yuan)、中生(sheng)(sheng)落葉闊葉灌(guan)叢和耐旱落葉灌(guan)叢等(deng)5個(ge)(ge)植(zhi)(zhi)(zhi)被(bei)亞型，11個(ge)(ge)重要群系(xi)(xi)。其中以典型草(cao)原(yuan)(yuan)的(de)(de)長(chang)芒(mang)草(cao)群系(xi)(xi)占優勢，為(wei)黃(huang)(huang)土(tu)(tu)高原(yuan)(yuan)叢生(sheng)(sheng)禾草(cao)草(cao)原(yuan)(yuan)的(de)(de)代表類型。其次為(wei)百里香、鐵桿蒿(hao)(hao)、茭蒿(hao)(hao)、委(wei)陵菜等(deng)。經幾年(nian)來的(de)(de)保(bao)護，草(cao)場(chang)生(sheng)(sheng)產力已由畝產鮮草(cao)100～150千克提高到(dao)400～600千克，是良好的(de)(de)常年(nian)牧(mu)場(chang)。

歷史

1982年，固(gu)原縣在云霧山建立(li)了面積達(da)4000公(gong)頃的草原自(zi)然保護區，1995年被列(lie)為省(sheng)(區)級自(zi)然保護區，這也是我國黃土高原建立(li)的第一(yi)個草地(di)類(lei)自(zi)然保護區。

地理環境

云霧山主

云(yun)霧山草原自然保護區(qu)峰海拔(ba)2128米，山基(ji)由白云(yun)巖、紅色砂礫組(zu)成，土壤(rang)為地灰褐土和(he)淡黑壚(lu)土，生長草甸植被。

自然資源

保護區內有植(zhi)物51科(ke)131屬(shu)182種(zhong)，動物40科(ke)74屬(shu)80種(zhong)，益蟲(chong)14科(ke)28種(zhong)，蜘蛛5科(ke)7種(zhong)。保護區所保護的(de)對(dui)象就(jiu)是這些草原植(zhi)被及其(qi)生態系統(tong)，包(bao)括氣(qi)候、土壤(rang)、昆蟲(chong)、野生動植(zhi)物、微(wei)生物等。

生態保護

自(zi)80年(nian)(nian)云霧山(shan)草(cao)(cao)原自(zi)然(ran)保(bao)護區自(zi)然(ran)風光(guang)代中(zhong)期于日本、美國(guo)(guo)、德國(guo)(guo)等(deng)(deng)生態(tai)(tai)學(xue)(xue)(xue)(xue)、土壤學(xue)(xue)(xue)(xue)和(he)(he)生物多(duo)樣性(xing)等(deng)(deng)方面的科(ke)(ke)學(xue)(xue)(xue)(xue)家開展了合作研(yan)究(jiu)，目前已成(cheng)(cheng)為(wei)中(zhong)國(guo)(guo)科(ke)(ke)學(xue)(xue)(xue)(xue)院水(shui)(shui)利部水(shui)(shui)土保(bao)持研(yan)究(jiu)所(suo)、西(xi)(xi)北農(nong)林(lin)科(ke)(ke)技大學(xue)(xue)(xue)(xue)、蘭州大學(xue)(xue)(xue)(xue)、寧夏(xia)大學(xue)(xue)(xue)(xue)草(cao)(cao)業科(ke)(ke)學(xue)(xue)(xue)(xue)研(yan)究(jiu)與研(yan)究(jiu)生培(pei)養(yang)、農(nong)業部狐貍野性(xing)化(hua)(hua)馴養(yang)和(he)(he)國(guo)(guo)家林(lin)業局退(tui)化(hua)(hua)生態(tai)(tai)系(xi)統(tong)定(ding)位(wei)監測(ce)基(ji)地及全(quan)球(qiu)氣候(hou)變(bian)化(hua)(hua)定(ding)位(wei)監測(ce)點(dian)，經(jing)過近30年(nian)(nian)的封(feng)禁和(he)(he)草(cao)(cao)原生態(tai)(tai)系(xi)統(tong)定(ding)位(wei)監測(ce)研(yan)究(jiu)，生態(tai)(tai)經(jing)濟社會效益顯著，已成(cheng)(cheng)為(wei)我國(guo)(guo)西(xi)(xi)部草(cao)(cao)原植被恢復與草(cao)(cao)原自(zi)然(ran)修復的一個(ge)成(cheng)(cheng)功典范，為(wei)國(guo)(guo)家退(tui)耕還林(lin)草(cao)(cao)與地方封(feng)山(shan)禁牧工程的實施提供了重要科(ke)(ke)學(xue)(xue)(xue)(xue)依據。

天然草地自然修復成效顯著

20世紀80年(nian)代初(chu)期(qi)，在(zai)(zai)區域考察的(de)(de)(de)基礎上(shang)，我(wo)們提出并在(zai)(zai)我(wo)國西部寧夏固(gu)原(yuan)云霧(wu)山(shan)建(jian)立了(le)(le)(le)最(zui)早的(de)(de)(de)典型(xing)草(cao)(cao)(cao)(cao)原(yuan)自(zi)然保(bao)護區，封(feng)(feng)(feng)禁(jin)保(bao)護面(mian)積由(you)0.23萬(wan)(wan)hm已擴大(da)到(dao)(dao)(dao)(dao)1 萬(wan)(wan)hm。通(tong)過近30年(nian)封(feng)(feng)(feng)禁(jin)定(ding)位試驗，根據草(cao)(cao)(cao)(cao)地(di)(di)(di)(di)(di)退(tui)化程度(du)采(cai)取封(feng)(feng)(feng)禁(jin)、改(gai)良(liang)、補播等草(cao)(cao)(cao)(cao)地(di)(di)(di)(di)(di)建(jian)設技術途徑，使(shi)退(tui)化草(cao)(cao)(cao)(cao)地(di)(di)(di)(di)(di)植(zhi)被種(zhong)類成分(fen)(fen)、牧草(cao)(cao)(cao)(cao)生(sheng)長(chang)(chang)發育和(he)(he)草(cao)(cao)(cao)(cao)地(di)(di)(di)(di)(di)生(sheng)境條件得(de)到(dao)(dao)(dao)(dao)了(le)(le)(le)全面(mian)改(gai)善(shan)，草(cao)(cao)(cao)(cao)地(di)(di)(di)(di)(di)生(sheng)產力有(you)了(le)(le)(le)很大(da)提高(gao)，草(cao)(cao)(cao)(cao)群(qun)種(zhong)類成分(fen)(fen)發生(sheng)了(le)(le)(le)顯(xian)著(zhu)變化。封(feng)(feng)(feng)禁(jin)初(chu)期(qi)，草(cao)(cao)(cao)(cao)原(yuan)植(zhi)物(wu)(wu)(wu)(wu)(wu)僅(jin)為(wei)53種(zhong)，其中(zhong)(zhong)灌(guan)(guan)木和(he)(he)半灌(guan)(guan)木占8%，草(cao)(cao)(cao)(cao)本占92%，多(duo)數以(yi)旱生(sheng)植(zhi)物(wu)(wu)(wu)(wu)(wu)組成，物(wu)(wu)(wu)(wu)(wu)種(zhong)密度(du)平(ping)均為(wei)5種(zhong)/m。隨(sui)(sui)封(feng)(feng)(feng)禁(jin)期(qi)延長(chang)(chang)物(wu)(wu)(wu)(wu)(wu)種(zhong)密度(du)逐(zhu)(zhu)漸增加(jia)，封(feng)(feng)(feng)禁(jin)的(de)(de)(de)第15年(nian)(1996年(nian))，物(wu)(wu)(wu)(wu)(wu)種(zhong)密度(du)達(da)到(dao)(dao)(dao)(dao)了(le)(le)(le)峰值，平(ping)均為(wei)33種(zhong)/m，是未封(feng)(feng)(feng)禁(jin)的(de)(de)(de)3.1倍(bei)，草(cao)(cao)(cao)(cao)地(di)(di)(di)(di)(di)群(qun)落物(wu)(wu)(wu)(wu)(wu)種(zhong)種(zhong)數達(da)到(dao)(dao)(dao)(dao)186種(zhong)，是未封(feng)(feng)(feng)禁(jin)的(de)(de)(de)3.5倍(bei)，其中(zhong)(zhong)灌(guan)(guan)木和(he)(he)半灌(guan)(guan)木占12%，草(cao)(cao)(cao)(cao)本占88%，多(duo)數以(yi)中(zhong)(zhong)生(sheng)和(he)(he)中(zhong)(zhong)旱生(sheng)植(zhi)物(wu)(wu)(wu)(wu)(wu)組成，并出現(xian)大(da)量森林草(cao)(cao)(cao)(cao)原(yuan)地(di)(di)(di)(di)(di)帶的(de)(de)(de)灌(guan)(guan)木和(he)(he)草(cao)(cao)(cao)(cao)本植(zhi)物(wu)(wu)(wu)(wu)(wu)種(zhong)。草(cao)(cao)(cao)(cao)地(di)(di)(di)(di)(di)覆蓋度(du)由(you)35%提高(gao)到(dao)(dao)(dao)(dao)95%，生(sheng)物(wu)(wu)(wu)(wu)(wu)量由(you)750提高(gao)到(dao)(dao)(dao)(dao)7560kg/hm。特別是在(zai)(zai)1986和(he)(he)1991年(nian)降(jiang)雨量274.8mm和(he)(he)259.7mm的(de)(de)(de)大(da)旱年(nian)份，寧夏固(gu)原(yuan)2/3的(de)(de)(de)地(di)(di)(di)(di)(di)方(fang)(fang)由(you)于(yu)干旱缺草(cao)(cao)(cao)(cao)造(zao)成60%~70%牲(sheng)(sheng)畜死亡，但封(feng)(feng)(feng)禁(jin)保(bao)護和(he)(he)改(gai)良(liang)草(cao)(cao)(cao)(cao)地(di)(di)(di)(di)(di)周圍的(de)(de)(de)鄉村5.0~6.0萬(wan)(wan)頭牲(sheng)(sheng)畜得(de)到(dao)(dao)(dao)(dao)了(le)(le)(le)挽救，直接減(jian)少經濟損(sun)失500萬(wan)(wan)元，充分(fen)(fen)發揮了(le)(le)(le)"自(zi)然保(bao)護區"和(he)(he)改(gai)良(liang)草(cao)(cao)(cao)(cao)地(di)(di)(di)(di)(di)的(de)(de)(de)顯(xian)著(zhu)作(zuo)用(yong)，保(bao)護區生(sheng)態、經濟、社會效益顯(xian)著(zhu)，受到(dao)(dao)(dao)(dao)了(le)(le)(le)各級政(zheng)府(fu)及群(qun)眾的(de)(de)(de)一致贊揚，得(de)到(dao)(dao)(dao)(dao)了(le)(le)(le)地(di)(di)(di)(di)(di)方(fang)(fang)政(zheng)府(fu)表彰和(he)(he)獎勵。但封(feng)(feng)(feng)禁(jin)15年(nian)后隨(sui)(sui)封(feng)(feng)(feng)禁(jin)時間的(de)(de)(de)延長(chang)(chang)，物(wu)(wu)(wu)(wu)(wu)種(zhong)密度(du)趨(qu)于(yu)下降(jiang)，第24-28年(nian)(2008年(nian))物(wu)(wu)(wu)(wu)(wu)種(zhong)密度(du)僅(jin)為(wei)19.1種(zhong)/m。封(feng)(feng)(feng)禁(jin)期(qi)過長(chang)(chang)因枯草(cao)(cao)(cao)(cao)層加(jia)厚而影響草(cao)(cao)(cao)(cao)地(di)(di)(di)(di)(di)自(zi)然更新(xin)與物(wu)(wu)(wu)(wu)(wu)種(zhong)多(duo)樣性增加(jia)。草(cao)(cao)(cao)(cao)地(di)(di)(di)(di)(di)土壤種(zhong)子(zi)庫研究表明，云霧(wu)山(shan)草(cao)(cao)(cao)(cao)地(di)(di)(di)(di)(di)土壤種(zhong)子(zi)庫在(zai)(zai)空間分(fen)(fen)布上(shang)呈(cheng)現(xian)一定(ding)的(de)(de)(de)規(gui)律性，種(zhong)子(zi)密度(du)在(zai)(zai)垂直分(fen)(fen)布上(shang)呈(cheng)現(xian)出由(you)表層土壤向深層逐(zhu)(zhu)層減(jian)少的(de)(de)(de)變化規(gui)律，水平(ping)分(fen)(fen)布上(shang)變化規(gui)律為(wei):封(feng)(feng)(feng)禁(jin)>放(fang)牧;陰(yin)坡>陽坡;下坡>中(zhong)(zhong)坡>上(shang)坡，這(zhe)些(xie)均是影響群(qun)落物(wu)(wu)(wu)(wu)(wu)種(zhong)多(duo)樣性增加(jia)和(he)(he)草(cao)(cao)(cao)(cao)地(di)(di)(di)(di)(di)繁殖更新(xin)的(de)(de)(de)關鍵問題。

通過近30年(nian)(nian)的(de)(de)(de)自然(ran)封(feng)(feng)禁試(shi)(shi)驗，明確提出(chu)草(cao)地(di)(di)(di)恢(hui)復(fu)的(de)(de)(de)適宜(yi)封(feng)(feng)禁期(qi):在(zai)半干旱區森林草(cao)原地(di)(di)(di)帶，草(cao)甸植被(bei)(bei)的(de)(de)(de)適宜(yi)恢(hui)復(fu)期(qi)為(wei)3~5年(nian)(nian)，方可(ke)(ke)進(jin)行合理的(de)(de)(de)放(fang)(fang)牧或(huo)刈(yi)割利用(yong)，對(dui)利用(yong)過度退化(hua)(hua)嚴重的(de)(de)(de)草(cao)甸植被(bei)(bei)在(zai)平水年(nian)(nian)需(xu)要封(feng)(feng)禁8~12年(nian)(nian);在(zai)典型草(cao)原地(di)(di)(di)帶，草(cao)地(di)(di)(di)植被(bei)(bei)適宜(yi)恢(hui)復(fu)期(qi)為(wei)5~8年(nian)(nian)，方可(ke)(ke)進(jin)行合理刈(yi)割和放(fang)(fang)牧利用(yong)，退化(hua)(hua)嚴重的(de)(de)(de)草(cao)地(di)(di)(di)植被(bei)(bei)在(zai)平水年(nian)(nian)約(yue)需(xu)封(feng)(feng)禁10~15年(nian)(nian);在(zai)荒漠草(cao)原地(di)(di)(di)帶，草(cao)地(di)(di)(di)植被(bei)(bei)適宜(yi)恢(hui)復(fu)期(qi)為(wei)10~12年(nian)(nian)，方可(ke)(ke)進(jin)行合理的(de)(de)(de)刈(yi)割和放(fang)(fang)牧利用(yong)，退化(hua)(hua)嚴重草(cao)地(di)(di)(di)在(zai)平水年(nian)(nian)約(yue)需(xu)封(feng)(feng)禁15~20年(nian)(nian)。這一結論(lun)通過多年(nian)(nian)的(de)(de)(de)試(shi)(shi)驗驗證，已建立了示(shi)范樣板，為(wei)同類型區天然(ran)植被(bei)(bei)恢(hui)復(fu)利用(yong)提供了重要科(ke)學依據。

封禁草地自然演替過程與規律

通過(guo)近30年(nian)(nian)(nian)的(de)(de)(de)封(feng)禁(jin)試驗(yan)，首次(ci)劃(hua)分(fen)了(le)草(cao)(cao)(cao)地植被(bei)恢復與(yu)(yu)時(shi)序演(yan)(yan)替過(guo)程，分(fen)為(wei)(wei)(wei)五(wu)個(ge)(ge)(ge)階(jie)(jie)段(duan)(duan):第一階(jie)(jie)段(duan)(duan)為(wei)(wei)(wei)種(zhong)(zhong)(zhong)(zhong)(zhong)(zhong)(zhong)群(qun)(qun)(qun)持續增(zeng)長聚集階(jie)(jie)段(duan)(duan)，即(ji)(ji)在(zai)封(feng)禁(jin)的(de)(de)(de)1~3年(nian)(nian)(nian)內(nei)以(yi)本(ben)氏(shi)針(zhen)茅(mao)(mao)(mao)(mao)鄉(xiang)土種(zhong)(zhong)(zhong)(zhong)(zhong)(zhong)(zhong)為(wei)(wei)(wei)主的(de)(de)(de)建群(qun)(qun)(qun)種(zhong)(zhong)(zhong)(zhong)(zhong)(zhong)(zhong)與(yu)(yu)其它優(you)勢種(zhong)(zhong)(zhong)(zhong)(zhong)(zhong)(zhong)、伴生種(zhong)(zhong)(zhong)(zhong)(zhong)(zhong)(zhong)和(he)偶見種(zhong)(zhong)(zhong)(zhong)(zhong)(zhong)(zhong)不斷適應新(xin)的(de)(de)(de)生境，各項生長指標(biao)穩定(ding)增(zeng)長;第二階(jie)(jie)段(duan)(duan)為(wei)(wei)(wei)種(zhong)(zhong)(zhong)(zhong)(zhong)(zhong)(zhong)間激烈(lie)(lie)競爭(zheng)階(jie)(jie)段(duan)(duan)，也(ye)是封(feng)禁(jin)的(de)(de)(de)第4~9年(nian)(nian)(nian)，植物數(shu)量大幅(fu)度(du)增(zeng)長，并適應了(le)新(xin)的(de)(de)(de)生境，且相互(hu)展(zhan)開了(le)激烈(lie)(lie)的(de)(de)(de)種(zhong)(zhong)(zhong)(zhong)(zhong)(zhong)(zhong)間競爭(zheng)與(yu)(yu)自然選擇;第三階(jie)(jie)段(duan)(duan)為(wei)(wei)(wei)建群(qun)(qun)(qun)種(zhong)(zhong)(zhong)(zhong)(zhong)(zhong)(zhong)加(jia)速恢復演(yan)(yan)替階(jie)(jie)段(duan)(duan)，即(ji)(ji)封(feng)禁(jin)的(de)(de)(de)10~15年(nian)(nian)(nian)，植物在(zai)激烈(lie)(lie)的(de)(de)(de)種(zhong)(zhong)(zhong)(zhong)(zhong)(zhong)(zhong)間競爭(zheng)中"物競天(tian)擇、適者生存(cun)"，本(ben)氏(shi)針(zhen)茅(mao)(mao)(mao)(mao)形成明(ming)顯(xian)建群(qun)(qun)(qun)種(zhong)(zhong)(zhong)(zhong)(zhong)(zhong)(zhong)，并不斷加(jia)速種(zhong)(zhong)(zhong)(zhong)(zhong)(zhong)(zhong)群(qun)(qun)(qun)自身的(de)(de)(de)恢復與(yu)(yu)擴展(zhan), 且已(yi)達到(dao)(dao)"亞頂極";第四階(jie)(jie)段(duan)(duan)為(wei)(wei)(wei)建群(qun)(qun)(qun)種(zhong)(zhong)(zhong)(zhong)(zhong)(zhong)(zhong)的(de)(de)(de)定(ding)居生長階(jie)(jie)段(duan)(duan)，封(feng)禁(jin)的(de)(de)(de)16~21年(nian)(nian)(nian)本(ben)氏(shi)針(zhen)茅(mao)(mao)(mao)(mao)種(zhong)(zhong)(zhong)(zhong)(zhong)(zhong)(zhong)群(qun)(qun)(qun)個(ge)(ge)(ge)體數(shu)量的(de)(de)(de)變化基本(ben)穩定(ding)在(zai)19株/m，占群(qun)(qun)(qun)落(luo)總數(shu)的(de)(de)(de)90.5%，已(yi)達到(dao)(dao)"亞頂極";第五(wu)階(jie)(jie)段(duan)(duan)22~28年(nian)(nian)(nian)本(ben)氏(shi)針(zhen)茅(mao)(mao)(mao)(mao)種(zhong)(zhong)(zhong)(zhong)(zhong)(zhong)(zhong)群(qun)(qun)(qun)的(de)(de)(de)生長繁(fan)殖受枯草(cao)(cao)(cao)層的(de)(de)(de)影響，個(ge)(ge)(ge)體數(shu)量急劇下(xia)降，優(you)勢種(zhong)(zhong)(zhong)(zhong)(zhong)(zhong)(zhong)大針(zhen)茅(mao)(mao)(mao)(mao)種(zhong)(zhong)(zhong)(zhong)(zhong)(zhong)(zhong)群(qun)(qun)(qun)的(de)(de)(de)數(shu)量巨增(zeng)，密度(du)為(wei)(wei)(wei)16~26株/m，有替代本(ben)氏(shi)針(zhen)茅(mao)(mao)(mao)(mao)的(de)(de)(de)趨(qu)勢。同時(shi)在(zai)草(cao)(cao)(cao)原(yuan)(yuan)群(qun)(qun)(qun)落(luo)生長的(de)(de)(de)溝(gou)道還出(chu)現(xian)大量的(de)(de)(de)中生灌木，多為(wei)(wei)(wei)森(sen)林草(cao)(cao)(cao)原(yuan)(yuan)區成分(fen)，已(yi)由草(cao)(cao)(cao)原(yuan)(yuan)群(qun)(qun)(qun)落(luo)坡(po)下(xia)部(bu)的(de)(de)(de)陰坡(po)或(huo)半陰坡(po)以(yi)片狀(zhuang)分(fen)布，逐漸向(xiang)草(cao)(cao)(cao)原(yuan)(yuan)腹地呈零星狀(zhuang)入侵(qin)，使草(cao)(cao)(cao)原(yuan)(yuan)群(qun)(qun)(qun)落(luo)的(de)(de)(de)演(yan)(yan)替進入了(le)一個(ge)(ge)(ge)重(zhong)要的(de)(de)(de)階(jie)(jie)段(duan)(duan)，形成了(le)一個(ge)(ge)(ge)明(ming)顯(xian)的(de)(de)(de)拐點，直到(dao)(dao)封(feng)禁(jin)的(de)(de)(de)第28年(nian)(nian)(nian)物種(zhong)(zhong)(zhong)(zhong)(zhong)(zhong)(zhong)豐富度(du)仍保(bao)持在(zai)148種(zhong)(zhong)(zhong)(zhong)(zhong)(zhong)(zhong)，具有典型(xing)草(cao)(cao)(cao)原(yuan)(yuan)群(qun)(qun)(qun)落(luo)向(xiang)森(sen)林草(cao)(cao)(cao)原(yuan)(yuan)群(qun)(qun)(qun)落(luo)類型(xing)演(yan)(yan)替發展(zhan)的(de)(de)(de)趨(qu)勢。

封禁草地適度刈割利用技術

在黃土高(gao)原(yuan)典型草(cao)原(yuan)地(di)帶，通過不同刈割(ge)強度試驗，表明適度刈割(ge)可使草(cao)地(di)保持較高(gao)的物種(zhong)多(duo)樣性(xing)和(he)生產力，并能促進草(cao)地(di)物質平衡及(ji)良(liang)性(xing)循環，為封禁草(cao)地(di)的合(he)理刈割(ge)利(li)用提供(gong)了重要依據。