新疆天山北坡山地草原植物生育节律分析

Study on the Growing Rhymes of Plants of Grassland in Northern Slope of Tianshan Mountain

天山北坡山地草原主要植物生育节律表现为：植物高度生长的高峰时期在抽穗前后，生物量增长旺盛时期在5月中旬至7月上旬；秋季羊茅、针茅再生，同时参与种冷蒿和木地肤处于生长期；草地植物群落生物量表现为春秋两季生长；植物群落生物量结构秋季发生变化，主要由于蒿类半灌木秋季生长的特点所致；群落生物量除受不同物种生育节律的影响，同时受10～20cm层土壤含水量影响。

The growing rhymes of plants in steppe in Northern Slope of Tianshan Mountains showed, （1） the blooming of height growth is round about in tassel time,and the time of maximum increase of biomass is between the middle ten days in May and the first ten days in July. （2）Festuce ovina and Stipa capillata regrow in Fall,Artemisia frigida and Kochia prostrata are in growing period. The communitive biomass showed two seasonal growth of spring and fail. （3）the variation of proportion of communitive biomass resuited from the growth of A rtemisia frigida. （4）the communitive biomass are affected by growing rhymes of plants as well as the water content in soil of 10-20cm.