| 土壤水分状况对14C标记秸秆的腐解及腐殖质中碳素分布的影响 |
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| 作者姓名： | WANG Zhi-Ming ZHU Pei-Li HUANG Dong-Mai |
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| 作者单位： | Institute of Soil and Fertilizer Jiangsu Academy of Agricultural Sciences, Nanjing 210014 (China);Institute of Soil and Fertilizer Jiangsu Academy of Agricultural Sciences, Nanjing 210014 (China);Institute of Soil and Fertilizer Jiangsu Academy of Agricultural Sciences, Nanjing 210014 (China) |
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| 基金项目： | *1Project (No.39430090) supported by the National Natural Science Foundation of China. |
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| 摘 要： | 14C-tracer technique and closed incubation method were used to study straw 14C decomposition and distribution in different fractions of newly formed humus under different moisture regimes. Decomposition of straw 14C was faster during the initial days, and slower thereafter. Decay rate constants of straw 14C varied from 3.29 × 10-3 d-1 to 7.06 × 10-3 d-1. After 112 d incubation, the amount of straw 14C mineralized was 1.17~1.46 times greater in submerged soils than in upland soils. Of the soil residual 14C, 9.08%~15.73% was present in humic acid (HA) and 31.01%~37.62% in fulvic acid (FA). Submerged condition favored the formation of HA, and HA/FA ratio of newly formed humus (labelled) was greater in submerged soils than in upland soils. Clay minerals affected the distribution of straw 14C in different humus fractions. Proportion of 14C present in HA to 14C remaining in soil was greater in Vertisol than in Ultisol.
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| 关 键 词： | 土壤水分状况 腐植质 秸秆降解 分布 秸秆^14C |
Straw 14C decomposition and distribution in humus fractions as influenced by soil moisture regimes |
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| WANG Zhi-Ming,ZHU Pei-Li,HUANG Dong-Mai.Straw 14C decomposition and distribution in humus fractions as influenced by soil moisture regimes[J].Pedosphere,1999,9(3):275-280. |
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| Authors: | WANG Zhi-Ming ZHU Pei-Li and HUANG Dong-Mai |
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| Institution: | Institute of Soil and Fertilizer Jiangsu Academy of Agricultural Sciences, Nanjing 210014 (China);Institute of Soil and Fertilizer Jiangsu Academy of Agricultural Sciences, Nanjing 210014 (China);Institute of Soil and Fertilizer Jiangsu Academy of Agricultural Sciences, Nanjing 210014 (China) |
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| Abstract: | 14C-tracer technique and closed incubation method were used to study straw 14C decomposition and distribution in different fractions of newly formed humus under different moisture regimes. Decomposition of straw 14C was faster during the initial days, and slower thereafter. Decay rate constants of straw 14C varied from 3.29 × 10-3 d-1 to 7.06 × 10-3 d-1. After 112 d incubation, the amount of straw 14C mineralized was 1.17~1.46 times greater in submerged soils than in upland soils. Of the soil residual 14C, 9.08%~15.73% was present in humic acid (HA) and 31.01%~37.62% in fulvic acid (FA). Submerged condition favored the formation of HA, and HA/FA ratio of newly formed humus (labelled) was greater in submerged soils than in upland soils. Clay minerals affected the distribution of straw 14C in different humus fractions. Proportion of 14C present in HA to 14C remaining in soil was greater in Vertisol than in Ultisol. |
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| Keywords: | decomposition distribution soil humus fractions soil moisture regimes straw 14C |
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