摘要
以青藏高原东部高寒草甸群落为研究对象,通过比较了不同施肥条件和不同刈割对群落地上生物量和多样性的影响。结果表明施肥可提高生物量且生物多样性降低,施肥和刈割处理后,施肥效应显著而刈割效应不显著,说明施肥是主效应。实验还发现施肥可提高群落的补偿能力;不同资源梯度的情况下植物群落对刈割处理后补偿作用也不相同,对刈割处理后植物群落补偿能力随资源的升高而增强。当未施肥和施肥30g/m2时相同强度的1次刈割的补偿能力较相同强度的2次刈割的补偿能力大;当施肥60g/m2和120g/m2时相同强度的2次刈割的补偿能力较相同强度的1次刈割的补偿能力大。
Understanding the effects of mowing and fertilizer on pasture land is critical for effective management. This study, at the Pasture Land Station of Maqu in southern Gansu, examined the effects of 4 fertilizer addition levels and 6 mowing intensities on Community structure and plant aboveground biomass. Our result showed that species richness decreased along fertilizing gradients, and the soil fertility treatments significantly affected aboveground biomass, with 30g/ m^2（ NH4 ） 2HPO4 resulting in the highest levels of aboveground biomass. The mowing treatment did not significantly affect aboveground biomass. The soil fertility and mowing treatments significantly affected community compensation ability. These results indicated that community compensation ability was directly related to the soil fertility levels, so that fertilizer can enhanced community compensation. Different fertilizer levels and mowing treatments had different effects on compensatory responseswith compensation ablity increasing along fertilizing gradients. The least fertile soil and 30g/m^2 （NH4）2HPO4with one mowing event had a compensation ability two times greater than other treatment combinations. The 60g/m^2 （NH4）2HPO4 soil fertility treatment and 120g/m^2 （NH4）2HPO4 with two mowing events resulted in lower compensation ability.
出处
《生态学报》
CAS
CSCD
北大核心
2007年第6期2288-2293,共6页
Acta Ecologica Sinica
基金
国家自然科学基金资助项目(90202000)~~
关键词
施肥
生物量
刈割
补偿效应
fertilizing
biomass
mowing
compensatory responses
