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Grassland and Turf
2010,30
(1)
50-55
不同季节放牧对矮嵩草草甸植物叶面积指数的影响
作 者：
苏爱玲;张振华;汪诗平;段吉闯;常小峰;杨晓霞;罗彩云;徐广平;胡宜刚
单 位：
中国科学院西北高原生物研究所
关键词：
冬春季放牧;夏秋季放牧;矮嵩草草甸;叶面积指数;相对生长速率
摘 要：
采用样方法对青藏高原高寒矮嵩草草甸冬春季放牧、夏秋季放牧和不放牧样地各类植物叶面积指数、相对生长速率、地上活植物量以及叶茎比进行了调查分析,以研究不同季节放牧对矮嵩草草甸的影响。结果表明,7~8月,地上活植物量都是先增加后降低,7月24日达到峰值,其中夏季放牧地上活植物量最大,322.7 g/m2。不放牧对其叶面积指数的影响不大,夏季放牧其叶面积指数不断增大,8月8日达到最大值3.9;冬季放牧其叶面积指数先降低后增加,7月24日降到最小值2.9;地上活生物量与叶面积指数之间呈正相关。3种处理下矮嵩草草甸植物1个月内相对生长速率变化不同,7月9日~7月24日,群落地上植物量的净积累为正增长过程(RGR>0),7月24日~8月9日呈负增长(RGR<0),植物量下降。冬春季放牧下矮嵩草草甸各类植物的叶茎比不断增加,8月8日达最大值6;夏秋季放牧先增加后降低,7月24日达最大值6.9;不放牧先降低后增加,7月24日降到最小值4.3,8月8日达到最大值6.6。
译 名：
The effects of grazing on LAI of Kobresia humilis alpine meadow system in different season
作 者：
SU Ai-ling1,2,ZHANG Zhen-hua1,2,WANG Shi-ping1,DUAN Ji-chuang1,2,CHANG Xiao-feng1,2,YANG Xiao-xia1,2,LUO Cai-yun1,2,XU Guang-ping1,2,HU Yi-gang1,2 (1.Key Laboratory of Adaptive and Evolution of Plateau Biology,Northwest Plateau Institute of Biology,Chinese Academy of Science,Xining 810001,China;2.Graduate School of the Chinese Academy of Science,Beijing 100049,China)
关键词：
winter grazing;summer grazing;Kobresia humilis alpine meadow;LAI;relative growth rate
摘 要：
Plant leaf area index,relative growth rate,the above-ground living biomass,and leaf stem biomass in field in alpine Kobresia humilis meadow in Qinghai-Tibet Plateau were study in different season.The results showed that from July to August,the above-ground living biomass is firstly increased and then decreased,the peak is on the July 24,and the greatest value is 322.7 g/m2,which is under the treatment of grazing in summer.Non-grazing has little effect on leaf area index.Leaf area index increased in summer,and reached maximum value of 3.9 on 8th August;while in winter it decreased first,then increased,and dropped to the minimum value of 2.9 on 24 July;The regression equation between the above-ground living biomass and leaf area index is y=47.345x+103.8(R2=0.54,P<0.001),there is a positive correlation between them.The changes of the relative growth rate in the Kobresia humilis meadow under three treatments are different.During July 9 to July 24,the net above-ground biomass accumulation is a positive growth process(RGR>0),while from July 24 to August 9,the net above-ground biomass accumulation is a negative growth process(RGR<0),the biomass are decreased.The leaf stem biomass ratio under treatment of grazing in winter is increased constantly,on August 8 reached the maximum 6;while the effect of other two treatments on the leaf stem biomass ratio are contrary,grazing in summer is firstly increased and then decreased,on July 24 reached the maximum 6.9;non-grazing is firstly decreased and then increased,on July 24 down to the minimum value of 4.3,on August 8 reached the maximum value of 6.6.
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