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綠色科技
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LVSE DASHIJIU
2015年
5期
1-3
,共3页
高寒草原%土壤N转化%硝化作用%反硝化作用%气候变化
高寒草原%土壤N轉化%硝化作用%反硝化作用%氣候變化
고한초원%토양N전화%초화작용%반초화작용%기후변화
alpine steppe%soil N transformation%nitrification%denitrification%climate change
指出了青藏高原是全球气候变化的敏感区域，气候的微小波动都会导致高原生态系统的格局、过程与功能发生改变。研究测定了模拟增温条件下藏北半干旱高寒草原生态系统土壤总硝化、反硝化速率及氮转化相关微生物变化动态，结果显示：在藏北高寒草原布设开顶式生长室造成土壤温度明显增加，但土壤的湿度下降了3．19％；增温对高寒草原土壤总硝化速率影响不大，但明显促进了高寒草原的反硝化速率，使高寒草原土壤反硝化速率增加了67％；高寒草原增温后土壤中氨化细菌、亚硝化细菌和反硝化细菌数量有所增加，土壤硝化细菌数量有所减少。
指齣瞭青藏高原是全毬氣候變化的敏感區域，氣候的微小波動都會導緻高原生態繫統的格跼、過程與功能髮生改變。研究測定瞭模擬增溫條件下藏北半榦旱高寒草原生態繫統土壤總硝化、反硝化速率及氮轉化相關微生物變化動態，結果顯示：在藏北高寒草原佈設開頂式生長室造成土壤溫度明顯增加，但土壤的濕度下降瞭3．19％；增溫對高寒草原土壤總硝化速率影響不大，但明顯促進瞭高寒草原的反硝化速率，使高寒草原土壤反硝化速率增加瞭67％；高寒草原增溫後土壤中氨化細菌、亞硝化細菌和反硝化細菌數量有所增加，土壤硝化細菌數量有所減少。
지출료청장고원시전구기후변화적민감구역，기후적미소파동도회도치고원생태계통적격국、과정여공능발생개변。연구측정료모의증온조건하장북반간한고한초원생태계통토양총초화、반초화속솔급담전화상관미생물변화동태，결과현시：재장북고한초원포설개정식생장실조성토양온도명현증가，단토양적습도하강료3．19％；증온대고한초원토양총초화속솔영향불대，단명현촉진료고한초원적반초화속솔，사고한초원토양반초화속솔증가료67％；고한초원증온후토양중안화세균、아초화세균화반초화세균수량유소증가，토양초화세균수량유소감소。
Qinghai -Tibet Plateau is a sensitive area of global change ,which means that the small climatic fluctuations will lead to the changes in the structure ,process and function of its ecosystem .Simulating the warming condition ,this article aims to monitor the ecosystem's soil nitrification ,denitrification rate and dy‐namics of soil microbial related to soil N transformation in semi -arid alpine steppe of northern Tibet .The results indicate that firstly ,the layout of an open -top chamber results in an increase of soil temperature in the experimental plots ,but soil moisture content declined by 3 .19% ;secondly ,warming has small influence on gross nitrification rate w hile it significantly promotes soil denitrification rate in the alpine steppe ,w hich increases the soil denitrification rates by 67% ;thirdly ,after the warming in alpine steppe ,the amount of am‐monifiers ,nitrite bacteria and denitrifier in the soil increase but the amount of nitrifier in soil decreases due to w arming .
