| 桂西南喀斯特季节性雨林凋落叶分解速率和养分含量特征分析 |
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| 关键词:karst seasonal rainforest litter decomposition rate nutrient content |
| 基金项目:国家自然科学基金(编号: 32071540; 31760141; 31800371);国家重点研发计划(编号: 2019YFC0507503) |
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| 摘要: |
| Analysis of the Leaf Litter Decomposition Rate and Nutrient Content in a Karst Seasonal Rainforest in Southwest Guangxi |
| Forest litter is an important part of forest ecosystem. Knowledge of the nutrient release characteristics of litter leaves during decomposition is needed to understand the mechanism underlying the material cycle and nutrient balance in forest ecosystems. In this study, the litter leaves in the karst seasonal rainforest in Southwest Guangxi were mixed evenly in 2018; an in-situ decomposition test was then performed using the decomposition bag method to evaluate the decomposition characteristics of litter in the karst seasonal rainforest. The results revealed that the whole weight loss pattern during the decomposition process of litter leaves was first fast and then slow. Under different habitat types, the rate of leaf weight loss was in this order: depression > slope > peak; the content of leaf C was in this order: peak > slope > depression; and the content of leaf N was in this order: slope > depression > peak. The rate of weight loss of litter leaves during the whole decomposition process negatively correlated with altitude and negatively correlated with slope at the early and middle late stages of de-composition. The C content of litter leaves positively correlated with altitude; however, its correlation with other environmental factors changed with the decomposition time. The results of the present study showed that the de-composition rate of litter leaves in the karst seasonal rainforest in Southwest Guangxi was lower than that in sub-tropical evergreen deciduous broad-leaved mixed forests, but similar to that in the degradation area of the same type of karst forest. The microenvironment factors represented by different habitat types in the karst seasonal rainforest had an important influence on the litter decomposition. The difference in temperature and humidity caused by altitude is the main factor affecting the litter decomposition rate, C content, and N content in the karst seasonal rainforest. |
| LI Yu-fei,GUO Yi-li,LI Xian-kun,LI Dong-xing,WANG Bin,CHEN Ting,LU Fang,XIANG Wu-sheng,HUANG Fu-zhao,LIU Sheng-yuan,LI Jian-xing,WEN Shu-jun,LU Shu-hua.2022.Analysis of the Leaf Litter Decomposition Rate and Nutrient Content in a Karst Seasonal Rainforest in Southwest Guangxi[J].Acta Geoscientica Sinica,43(4):483-490. |
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