东祁连山高寒草地生态系统N、P养分含量研究

对东祁连山高寒草地生态系统N、P养分在土壤和植被中含量分布规律进行了研究。结果表明（1）在东祁连山高寒草地生态系统中，两种养分的总含量分布规律为沼泽草地型（ZZ）嵩草草地型（SC）〉珠芽蓼-嵩草草地型（Z＋S）〉禾草草地型（HC），两种养分储量分别为N497．04kg／hm^2，P31．71kg／hm^2；生物量与养分储量分布规律一致；（2）东祁连山高寒草地±0～20cm土壤中，N、P储量分别为43．03t／hm^2和2．72t／hm^2；（3）在东祁连山高寒草地生态系统中，土壤养分库是东祁连山高寒草地生态系统的主要养分储存库。

N and P nutrients pool of alpine meadow ecologic system of east Qilian Mountain

Soil and plants N and P nutrients pool of alpine meadow ecologic system of east Qilian Mountain were analyzed.The results showed that distribution tendency of total nutrients content of N and P in the system is:Swamp meadow(ZZ)> Kobresia meadow(SC)>Polygonum-Kobresia meadow(Z+S)>Grass steppe(HC),the accumu1ation of N and P in plants was 497.04 kg/hm2 for N,and 31.71 kg/hm2 was for P.The accumulation of N and P was 43.03 t/hm2 and 2.72 t/hm2 respectively in soil(0～20 cm).Soil pool was the major pool of the nutrients in alpine meadow ecologic system of east Qilian Mountain.