摘要
本文报道了天祝高山草地的杜鹃＋柳－苔藓草地、珠芽寥草地、线叶嵩草草地及其改良的禾草－杂类草半人工草地、多年生禾草人工草地和一年生燕麦人工草地的生物量特征，净第一性生产力和光能转化率。位于阴坡的天然杜鹃＋柳－苔藓草地和珠芽寥草地的地上和地下生物量都较大。灌溉、施肥、翻耕和播种措施，可提高培育的草地的地上生物量和现有量，并降低地下生物量和现存量（活根量）。天然草地中珠芽寥草地的地上、地下和地上＋地下的净第一性生产力均最高，杜鹃＋柳－苔藓草地最小。三类培育的草地的地上部分净第一性生产力显著较其原生草地—线叶嵩草草地为高，并依培育强度而递增；但地下部分显著较低，并依培育强度而递减。杜鹃＋柳－苔藓草地、珠芽寥草地和线叶嵩草草地的地上部分光能转化率分别为０．０７４、０．１５５和０．１１０％。三类培育的草地地上部分的光能转化率大于天然草地，地下部分小于天然草地，全群落的光能转化率只有燕麦草地大于天然草地。
This article reports research results on the characteristics of biomass,net primary productivity and conversion efficiency of solar radiation in Tianzhu alpine Rhododendron + Salix- moss grassland(RMG),Polygonum viviparum gr-assland(PVG),Kobresia capillifolia grassland(KCG)and improved grass-forb semiartificial grassland,perennial grass artificial grassland and oat grass-land.The aboveground and underground maximum biomass of RMG and PVG on the northern slope are larger. The maximum aboveground biomass and standing crop in the ilnproved grasslands have been increased by irrigation,fertilization, ploughing and seeding,while the underground biomass has been decreased.Among the natural grasslands, the net primary productivity of the aboveground,underground and whole community(above underground part)of PVG are the highest,and that of RMG the lowest.The net primary pro-ductivity of the aboveground of the three types of improved grasslands are markedly higher than their origJnal grassland- KCG and increases with the intensity of improvement, but that of underground is markedly lower and de-creases with the intensity of improvement.The conversion efficiencies of to-tal radiation for aboveground in RMG, PVG and KCG are 0.074%,0.155% and 0.110%,respectively.The conversion efficiencies for aboveground of the three types of improved grasslands are higher than that of natural grassland with the exception of underground.The conversion efficiency for the whole community in oat grassland is higher than that of natural grassland.
出处
《植物生态学报》
CAS
CSCD
北大核心
1994年第2期121-131,共11页
Chinese Journal of Plant Ecology
关键词
高山草地
生物量
光能
转化率
Alpin grassland
Improved grassland
Biomass
Net primary productivity
Conversion efficiency of solar radiation
