Fan, Yanmin

Wang, Caihong

Zhu, Jinzhong

English

University of Kentucky

University of Kentucky UKnowledge International Grassland Congress Proceedings 21st International Grassland Congress / 8th International Rangeland Congress Study on Soil Properties of Degraded Desert Plain Grassland in North Tianshan of Xinjiang Yanmin Fan Xinjiang Agriculture University, China Jinzhong Zhu Xinjiang Agricultural University, China Caihong Wang Xinjiang Agricultural University, China 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/21/6-1/14 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. 瞯 ]736　 瞯 　 Multifunctional Grasslands in a Changing World 　 Volume Ⅰ 　Grasslands/Rangelands Resources and Ecology ——— Reclamation of Grasslands/RangelandsStudy on soil properties of degraded desert plain grassland in north Tianshan of XinjiangFan Y an‐min , Zhu Jin‐z hong , W ang Cai‐hongCollege o f G rassland Science , X inj iang A griculture University ;K ey L aboratory o f G rassland Resource and Ecology o fX inj ang , Urumqi , China , 830052 ; E‐mail :ym f an＠ sohu .comKey words :degraded desert grassland , degradation stage , grazing , livestock , soil propertiesIntroduction Xinjiang is one of China摧s main pastures , but its grassland has been degraded as a result of overloading grazing . Inthis study , the soil physical and chemical properties of the degraded desert grassland were studied to reveal the relationship oflivestock‐vegetation‐soil .Materials and methods The study was conducted in artemisia desert grassland at Ashili rural of Changji city in Xinjiang .Through field investigation of the status of species , the degraded series were divided into three stages : moderate degradation ,heavy degradation and over degradation ( Liu Hong‐lai , et al . ２００７ ) , and １２ representative plots were set . From moderatedegradation to over degradation , the predominance species is : Gagea bulbi f era ＋ Seriphidium transillense → Gagea bulbi f era＋ Geranium p ratense → Petrosimonia sibirica ＋ T rigonella arcuata ＋ Geranium p ratense . Soil samples of ０‐３０ cm depth weredug for analyzing the mechanical composition , bulk density , density , organic matter , total salt , total nitrogen , totalphosphorus , total potassium , available nitrogen , available phosphorus , and available potassium .Results and discussion From moderate to over degradation stage , the soil clay content increased gradually , the sand / clay ratiodescended significantly , decrease was ８５ .９％ , which indicates that the surface soil is not rough so as to emerge the landdesertification . Soil bulk density increased , and porosity decreased , the two were very significant negative correlation .Compared the soil bulk density of moderate degradation stage with heavy and over degradation stage , the difference wassignificant . In over degradation stage , the total salt content was minimum , but in the other stages , it was rather high , but soilhad not yet reached the soil salinization .Due to the number of livestock was large , a large number of animal manure were added into the soil , the organic matter wasgradually accumulated , which caused soil organic matter and soil nitrogen content to gradually increased , the total nitrogenincreased ３１ .８％ , available nitrogen increased ３５ .９％ , the three were very significant positive correlation , Some researchesconsider that grazing accelerates N cycle of grassland , especially heavy grazing ( Unkovich M , et al . １９９８) , so that the amountof available nitrogen conversion to the total nitrogen is increased , this study also proved this opinion .Soil phosphorus and potassium levels were reduced and then increased followed the degraded series , and the relation of total andavailable nutrient was significantly positive correlation . The influence of grazing intensity and livestock excretion on soilphosphorus and potassium was great ( Yu Jun‐ping , et al . ２０００) .Conclusions With the intensification of grassland degradation , soil physical properties changed bad , bulk density increasedsignificantly . The soil organic matter , available nitrogen and total nitrogen gradually increased . The contents of availablephosphorus , total phosphorus were undulate . The stability of grassland ecosystems has been depressed , so measures should betaken to reduce grazing intensity for promoting grassland ecosystems to benign development .ReferencesLiu Hong‐lai , et al . ２００７ . Division on degraded successional series of Seriphidium transillense desert grassland . X inj iangA gricultural Science Journal , ４４(２ ) : １３７‐１４１ .Unkovich M , Sanford P , Pate J , et al . １９９８ . Effects of grazing on plant and soil nitrogen relations of pasture crop rotations .Aust J A gric Res Journal , ４９(３ ) : ４７５‐４８５ .Yu Jun‐ping , Lan Yun‐feng , Wu Li‐ji , et al . ２０００ . Nitrogen circling of the grassland ecosystem in �soil‐grass animal" .Neimongol Prataculture Journal , ３ : ５３‐５６ .

Study on Soil Properties of Degraded Desert Plain Grassland in North Tianshan of Xinjiang

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Study on Soil Properties of Degraded Desert Plain Grassland in North Tianshan of Xinjiang

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