Biomass of fine roots and its relationship with water-stable aggregates in a composite ecosystem of triploid Populus tomentosa in the conversion of farmland to forest |
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Authors: | Chuan Fang Xianwei Li Jian Zhang Bing Fang Huixia Dong |
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Affiliation: | (1) State Key Laboratory of Ecological Forestry, Sichuan Agricultural University, Ya’an, 625014, China;(2) Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang, 110016, China;(3) College of Life Sciences, Henan Normal University, Xinxiang, 453007, China |
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Abstract: | A study on the biomass of fine roots and its relationship with water-stable aggregates (WSA) was conducted in two herbaceous models, triploid Populus tomentosa + Lolium multiflorum (TL) and triploid P. tomentosa + natural grass (TN). Both of the model triploid P. tomentosa stands were four years old converted from agriculture. Unconverted steep slope farmland was used as a control site. Results showed that the biomass of fine roots (⩽ 1 mm) in different layers varied in the following descending order: upper layer, middle layer and lower layer, at approximate ratios of 50:30:20. The average annual biomass of fine roots in ryegrass was twice that of the mixed natural grass-forest land. The total amount of natural grass roots was 4.4 times that of the ryegrass model. Water-stable aggregates of the upper, middle and lower layers and the unconverted farmland did not show any significant differences, whereas the amounts of water-stable aggregates of big-particles in the upper and middle layers were much larger than those of unconverted lands. The amounts of water-stable aggregates of natural grass-forest lands (TN model) were higher than those of managed grass-forest lands (TL model). Two-way analysis of variance indicated that fine roots (≤ 1 mm) could significantly enhance water-stable aggregates and total water-stable aggregates. We conclude that the program of converting agricultural lands to forest-grass lands is an effective way in improving soil anti-erosion capability. __________ Translated from Scientia Silvae Sinicae, 2007, 43(5): 24–29 [译自:林业科学] |
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Keywords: | fine root grass root biomass water-stable aggregate |
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