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Decay rate of Larix gmelinii coarse woody debris on burned patches in the Greater Khingan Mountains
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作者 Shubo Huang Lixiang Wen +2 位作者 Shuai Yin Meng Guo Fangbing Yu 《Journal of Forestry Research》 SCIE CAS CSCD 2021年第6期2349-2363,共15页
The decomposition of coarse woody debris(CWD)affects the energy flow and nutrient cycling in forest ecosystems.Previous studies on CWD have focused on the input,decomposition,reserve dynamics,and CWD functions,but coa... The decomposition of coarse woody debris(CWD)affects the energy flow and nutrient cycling in forest ecosystems.Previous studies on CWD have focused on the input,decomposition,reserve dynamics,and CWD functions,but coarse woody debris decomposition is complex and the results from different regions vary considerably.It is not clear which factors affect decay rate(k),especially at different decomposition stages.In this study,a single-exponential decay model was used to analyze the characteristics of CWD decomposition in Larix gmelinii forests over the 33 years following a fire in the Greater Khingan Mountains.The results show that the decay rate of coarse woody debris was positively correlated to decay class.The average decomposition rate was 0.019,and 41 years and 176 years are needed for a 50%and 95%mass loss,respectively.CWD nutrient content,density,and water content could explain the variance in the decay rate(~42%)of the decay factors such as amount of leaching,degree of fragmentation,respiration of the debris,and biotransformation,and varied significantly between different decay classes.Using the space-time substitution method,this study arranged the coarse woody debris of different mortality times to form a 33 year chronosequence which revealed the decomposition process.It was concluded that the decay rate was mainly explained by structural component of the debris and its nitrogen and water contents.This paper quantifies the indicators affecting CWD decay to explain the decomposition process. 展开更多
关键词 Coarse woody debris Decay rate Space–time substitution Boreal forest Fire disturbance
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Space Group Distribution in Substituted Phenols
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作者 ZHANG De-Chun ZHANG Yan-Qiu(Department of Chemistry, Suzhou University, Suzhou 215006) 《Chinese Journal of Structural Chemistry》 SCIE CAS CSCD 1997年第4期267-270,共4页
Analysis on the space group distribution in 78 substituted phenols re-vealed its unusual high frequencies in groups with non-centrosymmetry or polar axis orhigher symmetry or Z' > 1. Based on the characteristic... Analysis on the space group distribution in 78 substituted phenols re-vealed its unusual high frequencies in groups with non-centrosymmetry or polar axis orhigher symmetry or Z' > 1. Based on the characteristics of intermolecular H-bondsformed by two OH groups,the space group distribution could be rationalized well. 展开更多
关键词 substituted phenol space group distribution intermolecular H-bonding
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Some Properties of the Full Function Space and the Substitution Space
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作者 Zi Hou ZHANG Cun Yan LIU 《Journal of Mathematical Research and Exposition》 CSCD 2011年第5期887-897,共11页
In this paper, an equivalent relation among the reflexivity, weak sequential completeness and bounded completeness in full function space is given. Some results on weakly sequential compactness of subset and the prope... In this paper, an equivalent relation among the reflexivity, weak sequential completeness and bounded completeness in full function space is given. Some results on weakly sequential compactness of subset and the property (u) in substitution spaces are obtained. 展开更多
关键词 full function space substitution space weakly sequentially complete bounded complete property (u).
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