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森林水土保持效益机理的研究 被引量:2
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作者 李敏 杨克 《林业勘查设计》 2001年第2期40-40,共1页
分别对林冠层。
关键词 森林 水土保持效益 作用机理 林冠层 枯枝落叶层 森林土壤层
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Seasonal Patterns of Nitrogen and Phosphorus in the Litter and Soil Surface of Transitional Amazon Cerrado Forest, Brazil 被引量:1
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作者 J. de S. Nogueira L. Sanches +1 位作者 O.B. Pinto-Junior E.D. de Almeida 《Journal of Environmental Science and Engineering》 2011年第1期5-14,共10页
Measurements of litter production, and the surface litter pool were made over a 1 year period in a tropical transitional forest near Sinop, Mato Grosso Brazil with the aim of quantifying the seasonal variation of nitr... Measurements of litter production, and the surface litter pool were made over a 1 year period in a tropical transitional forest near Sinop, Mato Grosso Brazil with the aim of quantifying the seasonal variation of nitrogen and phosphorus in the litter and the annual contribution of nutrients to the soil. Average annual litterfall (+95% confidence interval (CI)) was 8.20 ton.ha^-1 year^-1 and forest floor litter mass was 58.63 ton'hal. Nitrogen and phosphorus in the forest floor litter mass was highest during the dry and dry-wet season, being 38% higher than in the wet and wet-dry season. Seasonal variation in the litter and concentration of nutrients was explained by seasonal variations in the climate, for example in the precipition and soil humidity. Average annual nitrogen and phosphorus concentrations in the forest floor mass were 17.24 ton.ha^-1 and 16.46 ton.ha^-1, respectively. The more significant forest floor mass fraction for returning soil nutrients was the leaves. The concentration of nutrients was higher in the soil superficial layer (at depths between 0-5 cm) than at depths between 30-70 cm, approximately 83% and 93% for total nitrogen and available phosphorus, respectively. 展开更多
关键词 Tropical forest litterpool nutrient cycling LITTERFALL
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Comparison of Soil Moisture in Different Soil Layers between Three Typical Forests in the Upper Reaches of Lijiang River Basin, Southern China
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作者 LI Haifang LIU Qinghua +2 位作者 LI Shimei LI Wei YANG Jinming 《Journal of Resources and Ecology》 CSCD 2019年第3期307-314,共8页
Throughfall, stemflow, evapotranspiration and infiltration are likely to vary with forest types, and consequently affect soil moisture regimes in different soil layers. In this study, the spatial and temporal characte... Throughfall, stemflow, evapotranspiration and infiltration are likely to vary with forest types, and consequently affect soil moisture regimes in different soil layers. In this study, the spatial and temporal characteristics of soil moisture were investigated to understand variations in soil moisture in three typical forests, including Phyllostachys pubescens forest (abbreviated as PPF), Schima superba forest (abbreviated as SSF) and Cunninghamia lanceolata forest (abbreviated as CLF) in the upper reaches of Lijiang River basin in southern China. The results showed that,(1) Litterfall and soil physical properties differed significantly in the three typical forests. Infiltration capacity in SSF was more favorable to soil moisture than in PPF and CLF.(2) Large variations were found in soil moisture at different forest stands and depths. Due to complicated vertical structures, there were obvious differences in soil moisture from the 0-20 cm soil layer to the 50-80 cm soil layer.(3) Average soil moisture in each layer was higher in SSF than in PPF and CLF.(4) Soil moisture in different layers correlated closely with precipitation (P<0.01) and the three typical forests had the same change trends with rainfall during the studying period.(5) In topsoil, soil moisture was influe need by soil properties which were mostly determined by litterfall, while in deep soil, soil moisture was affected by variations of soil characteristics, which were mostly determined by root distribution. This study provides a scie ntific basis for better un dersta nding the relati on ships betwee n forest vegetati on and its hydrological effects, helping to facilitate water resources conservation and achieving wise forest management in the upper reaches of Lijiang River basin. 展开更多
关键词 soil moisture different soil layers typical forests southern China
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