| Transformation of Carbon and Nitrogen by Earthworms in the Decomposition Processes of Broad-leaved Litters |
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| 作者姓名： | DONG Weihua YIN Xiuqin |
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| 作者单位： | College of Urban and Environmental Science，Northeast Normal University，Changchun 130024，China |
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| 摘 要： | Earthworms are the important constituents in the decayed food web and the main ecological conditioners in the process of decomposition and nutrient mineralization. The transformation of organic carbon (C) and total nitrogen (N) in the broad-leaved litters ingested by earthworms was researched by means of a laboratory experiment. Experimental samples were collected from broad-leaved Korea Pine mixed forest in Liangshui National Natural Reserve (47°10′50″N, 128°53′20″E) in the northeastern Xiao Hinggan Mountains of Northeast China. The contents of organic C and total N in earthworms, leaf litters and earthworm faeces were analyzed. Results show that the organic C content was in the fol- lowing order: leaf litters>faeces>earthworms, while total N content was contrary to that of the organic C. The organic C contents in the different leaf litters were in the following order: Tilia amurensis>Betula costata>Acer mono, whereas the total N contents in the different leaf litters were: Betula costata>Tilia amurensis>Acer mono. The contents of organic C and total N in the faeces from the different leaf litters were almost consistent with the contents of the leaf litters. After the leaf litters were ingested by earthworms, the organic C, which was transformed to increase earthworms' weights, ac- counted for 3.90%-13.31% of the total ingestion by earthworms, while that in the earthworm faeces accounted for 6.14%-13.70%. The transformed organic C through the other metabolism (e.g., respiration) of earthworms accounted for 75.04%-89.92%. The ingested organic C by earthworms was mostly used for metabolic activities. The N ingested by earthworms was less than organic C. It is estimated that 37.08% of total N was transformed to increase the earthworm's weight, 19.97% into earthworm faeces and 47.86% for the consumption of the earthworm's activities. The earthworms not only increased the content of organic C and total N in the soil, but also decreased the values of C/N in the soil and leaf litters. Earthworms play a major role in the leaf litters' decomposition and transformation.
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| 关 键 词： | 阔叶落叶林 有机碳 蚯蚓 碳转化 氮转化 |
| 收稿时间： | 8 August 2006 |
| 修稿时间： | 2006-08-082007-02-10 |
Transformation of carbon and nitrogen by earthworms in the decomposition processes of broad-leaved litters |
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| DONG Weihua YIN Xiuqin.Transformation of Carbon and Nitrogen by Earthworms in the Decomposition Processes of Broad-leaved Litters[J].Chinese Geographical Science,2007,17(2):166-172. |
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| Authors: | Dong Weihua Yin Xiuqin |
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| Institution: | (1) College of Urban and Environmental Science, Northeast Normal University, Changchun, 130024, China |
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| Abstract: | Earthworms are the important constituents in the decayed food web and the main ecological conditioners in the process of decomposition
and nutrient mineralization. The transformation of organic carbon (C) and total nitrogen (N) in the broad-leaved litters ingested
by earthworms was researched by means of a laboratory experiment. Experimental samples were collected from broad-leaved Korea
Pine mixed forest in Liangshui National Natural Reserve (47°10′50″N, 128°53t’20″E) in the northeastern Xiao Hinggan Mountains
of Northeast China. The contents of organic C and total N in earthworms, leaf litters and earthworm faeces were analyzed.
Results show that the organic C content was in the following order: leaf litters>faeces>earthworms, while total N content
was contrary to that of the organic C. The organic C contents in the different leaf litters were in the following order: Tilia amurensis>Betula costata>Acer mono, whereas the total N contents in the different leaf litters were: Betula costata>Tilia amurensis>Acer mono. The contents of organic C and total N in the faeces from the different leaf litters were almost consistent with the contents
of the leaf litters. After the leaf litters were ingested by earthworms, the organic C, which was transformed to increase
earthworms’ weights, accounted for 3.90%–13.31% of the total ingestion by earthworms, while that in the earthworm faeces accounted
for 6.14%–13.70%. The transformed organic C through the other metabolism (e.g., respiration) of earthworms accounted for 75.04%–89.92%.
The ingested organic C by earthworms was mostly used for metabolic activities. The N ingested by earthworms was less than
organic C. It is estimated that 37.08% of total N was transformed to increase the earthworm’s weight, 19.97% into earthworm
faeces and 47.86% for the consumption of the earthworm’s activities. The earthworms not only increased the content of organic
C and total N in the soil, but also decreased the values of C/N in the soil and leaf litters. Earthworms play a major role
in the leaf litters’ decomposition and transformation.
Foundation item: Under the auspices of the National Natural Science Foundation of China (No. 40171053) |
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| Keywords: | broad-leaved litters organic carbon total nitrogen earthworm C transformation N transformation |
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