Thinning promotes the nitrogen and phosphorous cycling in forest soils

自行车 土壤水分 环境科学 矿化(土壤科学) 氮气 氮气循环 稀释 硝化作用 农学 土壤科学 林业 化学 生态学 生物 地理 有机化学
作者
Tao Zhou,Chuankuan Wang,Zhenghu Zhou
出处
期刊:Agricultural and Forest Meteorology [Elsevier BV]
卷期号:311: 108665-108665 被引量:44
标识
DOI:10.1016/j.agrformet.2021.108665
摘要

• Responses of soil N and P cycling to thinning were conducted by a meta-analysis. • Thinning increases soil N and P cycling, but has no effect on N 2 O emission. • Thinning-induced changes in soil N fluxes depend upon climates and forest biomes. Thinning, a major practice of even-aged forest management, notably affects the stand structure and microclimates and thus in turn soil nitrogen (N) and phosphorous (P) cycling. However, the magnitude and direction of these effects remain uncertain. We performed a meta-analysis of 1228 observations from 115 studies worldwide to explore the effects of thinning on forest soil N and P processes. The results showed that thinning increased the concentrations of soil nitrate, total P, and available P by 11.7%, 6.1%, and 11.4%, respectively, but had no effect on the concentrations of soil total N and ammonium. Thinning stimulated soil microbial activities regulating soil N and P cycling, evidenced by the increased microbial biomass N and the activities of N- and P-acquiring extracellular enzymes. Thinning also increased net N mineralization and nitrification rates, but did not significantly affect N 2 O emission. However, these thinning effects varied with climates and forest biomes. The effect sizes of N-cycling processes were significantly correlated with mean annual precipitation or mean annual temperature, implying that these N fluxes are more sensitive to thinning in warm and humid regions. Collectively, our meta-analysis indicates that thinning promotes forest soil N and P cycling and increases the soil fertility, which are conducive to improving forest ecosystem functions.
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