摘要:选取内蒙古温带典型草原,进行连续 6a 氮磷添加试验,采用土壤特征微生物 PLFA 生物标记技术,研究 6 个氮添加水平 N0(0 kg N hm-2 a-1) 、N1(56 kg N hm-2 a-1) 、N2(112 kg N hm-2 a-1) 、N3(224 kg N hm-2 a-1) 、N4(392 kg N hm-2 a-1) 、N5(560 kg N hm-2 a-1) 和 6 个磷添加水平 P0(0 kg P hm-2 a-1) 、P1(15.5 kg P hm-2 a-1) 、P2(31 kg P hm-2 a-1) 、P3(62 kg P hm-2 a-1) 、P4(93 kg P hm-2 a-1) 、P5(124 kg P hm-2 a-1
The eddy covariance technique is a micrometeorological method to directly measure the exchanges of carbon, water and energy between the vegetation and atmosphere. The spatial resolution of meteorological observation of fluxes can expand from tens of meters to kilometers. The eddy covariance method is most accurate when the contributing area of the fluxes is topographically flat, and vegetation extends uniformly within the footprint area. Currently there are more than 100 eddy covariance flux observation sites in China. Most of them are established in non鄄ideal conditions such as forest, undulating surface, patchy canopy area. Therefore, it is important to accurately interpret the ecological representativeness of flux data by evaluation of the spatial representativeness of its footprint in China. This paper reviews basic theories of the footprint, along with progress and applications about footprint functions. It discusses the research focus and difficulties when
Fertilizer application is one of the most important management practices for improving soil fertility and increasing crop yield. However, it is far from certain how different forms of fertilizer affect the soil aggregate composition and carbon and nitrogen dynamics, especially for reddish paddy soils although it is one of the most popular soil types in China. A long鄄
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