摘要
对青藏高原东缘窄叶鲜卑花土壤转化酶与脲酶活性对增温(0.6~1.3℃)和植物去除的响应进行研究,以了解气候变暖和植被干扰对高寒灌丛生长季不同时期土壤生态过程的影响.结果表明:增温在整个生长季节使去除/不去除植物处理土壤转化酶活性显著增加了3.7%~13.3%.增温除在生长季末期对不去除植物处理土壤脲酶活性影响不显著以外,在其他时期使去除/不去除植物处理土壤脲酶活性显著增加10.8%~56.3%.去除植物处理对土壤转化酶与脲酶活性的影响因增温与生长季节而存在显著差异.去除植物显著降低了不增温样方生长季初期和末期与增温样方整个生长季节土壤转化酶活性,而没有显著影响生长季中期不增温样方土壤转化酶活性.去除植物仅在生长季末期使不增温样方土壤脲酶活性显著降低了10.5%;而在增温样方,去除植物仅在生长季初期和中期使土壤脲酶活性显著降低16.0%~18.7%.以上结果有利于全面认识高寒灌丛生态系统土壤碳氮循环过程.
To understand the effects of climate warming and vegetation disturbance on soil ecological process during different stages of growing season in the alpine scrub ecosystem,the responses of soil invertase and urease activities to warming（ 0.6-1.3 ℃） and plant removal were investigated in a Sibiraea angustata scrubland on the eastern Qinghai-Tibetan Plateau,China. The results showed that experimental warming significantly increased soil invertase activity by 3. 7%-13. 3% in the removal-and unremoval-plant plots throughout the entire growing season. Warming significantly increased soil urease activity by 10.8%-56.3% in the removal-and unremoval-plant plots,except the late growing stage,during which warming had no significant effect on soil urease activity in the unremoval-plant plots. The effects of plant removal treatments on soil invertase and urease activities varied with warming and growing stages. Plant removal significantly decreased soil invertase activity of the warmed plots during the entire growing season and the unwarmed plots during the early and late growing stages,but did not affect soil invertase activity in the unwarmed plots during the mid-growing stage. Plant removal only significantly decreased soil urease activity by 10. 5% in the unwarmed plots during the late growing stage. However,in the warmed plots,plant removal significantly decreased soil urease activity by 16.0%-18.7% during the early and mid growing stages. The results would increase our understanding of soil carbon and nitrogen cycling process in the alpine scrub ecosystems.
作者
马志良
赵文强
刘美
朱攀
刘庆
MA Zhi-liang;ZHAO Wen-qiang;LIU Mei;ZHU Pan;LIU Qing(Key Laboratory of Mountain Ecological Restoration and Bioresource Utilization,Chinese Academy of Sciences/Sichuan Province Key Laboratory of Ecological Resto-ration and Biodiversity Conservation,Chengdu Institute of Biology,Chinese Academy of Sciences,Chengdu 610041,China;University of Chinese Academy of Sciences,Beijing 100049,China;Sichuan Province Key Laboratory of Ecological Security and Protection,Mianyang Teachers＇ College,Mianyang 621000,Sichuan,China）.)
出处
《应用生态学报》
CAS
CSCD
北大核心
2018年第7期2211-2216,共6页
Chinese Journal of Applied Ecology
基金
国家自然科学基金项目(31570476)
国家科技基础性工作专项(2015FY110300)资助
