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。
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 peak is on the July 24,and the greatest value is 322.7 g/m2 ,which is under th increased and then decreased,the e 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 2.9on 24 8th Augu July; The st; while in winter it decreased first, then increased, and dropped to the minimum value of 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 chan tive growth rate in the Kobresia humilis meadow under three treatments are different. During Ju the net above-ground biomass accumulation is a positive growth process （RGR^0）, while from ges of the rela- ly 9 to July 24, July 24 to Au- gust 9,the net above-ground biomass accumulation is a negative growth process （RGR%0）,the biomass are de- creased. 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.
出处
《草原与草坪》
CAS
2010年第1期50-55,共6页
Grassland and Turf
基金
中国科学院知识创新工程项目(KSCX2-YW-N-04
KZCX2-XB2-06-01)
"百人计划"择优支持项目
自然科学基金项目(30871824)资助
