Li, Changhui

Li, Jilan

Li, Xilai

Lian, Youjun

Lu, Guangxin

Sun, Haiqun

Zhang, Ying

English

University of Kentucky

University of Kentucky UKnowledge International Grassland Congress Proceedings 21st International Grassland Congress / 8th International Rangeland Congress Research on Classification Criteria of Heitutan (Black Soil Beach) Degraded Grassland in Sanjiangyuan Region Xilai Li Qinghai University, China Haiqun Sun Qinghai University, China Changhui Li Qinghai University, China Guangxin Lu Qinghai University, China Youjun Lian Qinghai University, China See next page for additional authors Follow this and additional works at: https://uknowledge.uky.edu/igc  Part of the Plant Sciences Commons, and the Soil Science Commons This document is available at https://uknowledge.uky.edu/igc/21/6-2/28 The 21st International Grassland Congress / 8th International Rangeland Congress took place in Hohhot, China from June 29 through July 5, 2008. Proceedings edited by Organizing Committee of 2008 IGC/IRC Conference Published by Guangdong People's Publishing House This Event is brought to you for free and open access by the Plant and Soil Sciences at UKnowledge. It has been accepted for inclusion in International Grassland Congress Proceedings by an authorized administrator of UKnowledge. For more information, please contact UKnowledge@lsv.uky.edu. Presenter Information Xilai Li, Haiqun Sun, Changhui Li, Guangxin Lu, Youjun Lian, Jilan Li, and Ying Zhang This event is available at UKnowledge: https://uknowledge.uky.edu/igc/21/6-2/28 　 Multifunctional Grasslands in a Changing World 　 Volume Ⅰ 　 瞯 ]801　 瞯Grasslands/Rangelands Resources and Ecology ——— Reclamation of Grasslands/RangelandsResearch on classification criteria of Heitutan ( black soil beach ) degraded grassland inSanjiangyuan regionL i X i‐lai Sun H ai‐qun L i Chang‐hui Lu Guang‐x in L ian You‐j un L i Ji‐lan Zhang Y ingA gricultural and Husbandry College o f Qinghai University . X ining , 810003 , ChinaKey words : Heitutan degraded grassland , classification criteria , alpine meadow , Qinghai‐Tibet Plateau , Sanjiangyuan regionThe severe problems of ecosystem environment in Sanjiangyuan , in which was the source of Yangzi , Yellow and Lan‐Cang‐jiangRiver in southern Qinghai of China , were extensively attracted by lots of researchers around the world , especially problems ofHeitutan degraded grassland . To restore Heitutan degraded grassland on alpine meadow , the research of classification criteriaof Heitutan ( black soil beach ) degraded grassland in Sanjiangyuan was conducted in this paper . The sites were located inSanjiangyuan region , in which was part of Qinghai‐Tibet Plateau . The Heitutan degraded grassland was formed by humanactivities , overgrazing , rodents and so on conditions , it was not a normal type . Its species composition , community structure ,biodiversity , biological productivity , soil and micro‐environment , and other aspects of the degraded grassland system haveobviously changed compared with its original state of equilibrium or evolutionary succession in the natural system . Therefore ,the indicators selected were not consideration climate factor , only selected the vegetation cover , a stone cover aboveground ,advantages of four kinds of economic groups , edible forage ratio , the effective numbers and the average numbers of rodentholes , the average rate of rodent destruction , soil thickness , number of layers and slope , and elevation , as a total of １４ kinds ofindicators of the degraded grassland for cluster analysis . Test plots were located in the seven counties of Sanjiangyuan areas ,total of ４５ plots . In each plot , the １４ indicators were determined , which above mentioned .Using hierarchical cluster analysis of statistical software SPSS １１ .５０ to cluster , the cluster method adopted between‐groupslinkage . The coefficient of the distance adopted squared Euclidean distance . The scope of the changes in each index was relativelarger , therefore , data standardization choice Range (‐１ ,１ ) , and the graphics output using Dendrogram in the process ofclustering .According to key indicators of all degraded grassland , the classification criteria of Heitutan degraded grassland were sorted outfrom ４５ plots in Sanjiangyuan ( Table １) .Table 1 The classi f ication criteria o f Heitutan degraded grassland in Sanj iangyuan .Heitutan degradedgrasslandThe averagenumber of hole( per/ ha)DominancepoisonousweedsThe proportionof edible plants( ％ )Stone coverageaboveground( ％ )Vegetationcoverage ( ％ )CyperaceaedominanceOriginal type ０‐４００ 鲻０‐２０ 厖７０‐１００ 灋０‐１０ �８０‐１００  ３０‐５０ ЁMiddle ４００‐１０００ �２０‐３０ 吵５０‐７０ p１０‐３０ -６０‐８０ 觋２０‐３０ ЁSevere １０００‐４０００ �３０‐５０ 吵４０‐２５ p３０‐５０ -８０‐６０ 觋１０‐２０ ЁExtreme ＞ ４０００ 4＞ ５０ 晻０‐２５ B＞ ５０  ０‐５０ 技０‐１０ yBeach Middle ＜ １０００ 4＜ ３０ 晻＞ ５５ R＜ １５  ＜ ３０ 烫＞ ２０ 墘Severe １０００‐４０００ �３０‐５０ 吵２５‐５５ p１５‐５０ -３０‐８０ 觋１０‐２０ ЁExtreme ＞ ４０００ 4＞ ５０ 晻＜ ２５ R＞ ５０  ＞ ８０ 烫０‐１０ ySlope Middle ＜ １０００ 4＜ ３０ 晻＞ ５５ R＜ ３０  ＜ ３０ 烫＞ ２０ 墘Severe １０００‐４０００ �３０‐５０ 吵２５‐５５ p３０‐５０ -３０‐８０ 觋１０‐２０ ЁExtreme ＞ ４０００ 4＞ ５０ 晻＜ ２５ R＞ ５０  ＞ ８０ 烫０‐１０ yNote : the beach slope : ００‐７０ , slope gradient : ７０‐２１０ .Through cluster analysis methods , the classification criteria of Heitutan degraded grassland in Sanjiangyuan were researched .There are different classification criteria in different degraded grassland . From primary grassland to extreme degradedgrassland , the numbers of grassland classification were ３ ,１２ , ８ and ４ separately , because of community competition . This wasshowed that primary grassland and extreme degraded grassland type were both less number types than middle and severedegraded grassland , in which the community competition were of intensity . The Heitutan degraded grassland could be dividedtwo kinds of ecological types , which were beach and slope . Each ecological type could be divided into middle , severe andextreme degraded grassland type . The classification indicators of Heitutan degraded grassland included the average numbers ofrodent holes , dominance poisonous weeds , the proportion of edible plants , stone coverage aboveground , vegetation coverage ,and Cyperaceae dominance . Community types of extreme Heitutan degraded grassland were quite simple and their communitiestend to stability . The change of degraded types of that was relative less , but in middle and severe degraded type , grasslandvegetation was not stable , community competition was intense , and its community structure was complex , especially the middledegraded type . The management measures of all kinds of degraded grassland were proposed .

Research on Classification Criteria of Heitutan (Black Soil Beach) Degraded Grassland in Sanjiangyuan Region

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Research on Classification Criteria of Heitutan (Black Soil Beach) Degraded Grassland in Sanjiangyuan Region

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