| 不同植物凋落物对土壤有机碳淋失的影响及岩溶效应 |
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| 引用本文： | 曹建华,潘根兴,袁道先.不同植物凋落物对土壤有机碳淋失的影响及岩溶效应[J].第四纪研究,2000,20(4):359-366. |
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| 作者姓名： | 曹建华 潘根兴 袁道先 |
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| 作者单位： | [1]南京农业大学农业资源与生态环境研究所,南京 [2]中国地质科学院岩溶地质研究所,国土资源部 |
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| 基金项目： | 国家自然科学基金!（批准号:49632100），国家自然科学基金!（批准号:49972087），国土资源部重点科技项目!批准号:9501104，国土资 |
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| 摘 要： | 以低含量有机碳的岩溶土壤（ＳＯＣ， ０．８９％）为媒介，每１５０ｇ上添加松针、梧桐叶粉各 ７．５ｇ，１５ｇ，４个试验土柱号分别为ＳＣＣ３，ＳＣＣ５；ＳＢＣ３，ＳＢＣ５，接种岩溶土壤微生物群落后，于 恒温室内进行培养淋溶实验。结果表明，土壤淋溶液的电导值受土壤有机质含量多少及性质 的影响。土壤水溶性有机碳（ＤＯＣ）淋失总量ＳＣＣ３为５４０．７ｍｇ，ＳＣＣ５为１５２２．９ｍｇ；ＳＢＣ３为 ３８３．２ｍｇ，ＳＢＣ５为５６３．５ｍｇ。同时，土壤环境中Ｃａ２＋的释放总量ＳＣＣ３为１４５．７ｍｇ，ＳＣＣ５为 ２８８．７ｍｇ； ＳＢＣ３为１７０．０ｍｇ，ＳＢＣ５为１６７．９ｍｇ。两者呈正相关，相关系数ｒ２＝０．８５。下伏碳酸 盐岩的溶蚀量排序为ＳＣＣ５＞ＳＢＣ３＞ＳＣＣ３＞ＳＢＣ５，表明两种不同植物凋落物经微生物分 解，产生不同质和量的ＤＯＣ，并导致土壤环境中 Ｃａ２＋释放的差异和不同的岩溶效应。从而初步揭示不同有机碳分解导致ＤＯＣ淋失的差异性，以及ＤＯＣ对岩溶动力系统的驱动。这与Ａ．Ｈｅｙｅｓ和Ｔ．Ｒ．Ｍｏｏｒｅ的研究结果一致。
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| 关 键 词： | 植物凋落物 土壤有机碳 水溶性有机碳 岩溶效应 |
| 收稿时间： | 2000-04-09 |
| 修稿时间： | 2000-04-09 |
INFLUENCE OF TWO LITTERS ON THE SOIL ORGANIC CARBON LEACHINGS AND ITS KARST EFFECT |
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| Cao Jianhua, Pan Genxing, Yuan Daoxian.INFLUENCE OF TWO LITTERS ON THE SOIL ORGANIC CARBON LEACHINGS AND ITS KARST EFFECT[J].Quaternary Sciences,2000,20(4):359-366. |
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| Authors: | Cao Jianhua Pan Genxing Yuan Daoxian |
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| Institution: | Cao Jianhua
;(Institute of Resources, Etosystem and Environment for Agriculture. Nanjing Agricultural University, Nanjing 210095);Cao Jianhua
;(Institute of Karst Geology, Chinese Academy of Geological Sciences;Karst Dynamics Laboratory.Ministry of Land and Resources, Guilin 541004);Pan Cenxing
;(Institute of Resources, Etosystem and Environment for Agriculture. Nanjing Agricultural University, Nanjing 210095);Yuan Daoxian
;(Institute of Karst Geology, Chinese Academy of Geological Sciences;Karst Dynamics Laboratory.Ministry of Land and Resources, Guilin 541004) |
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| Abstract: | The bulk organic carbon, 14C apparent ages and δ13C distribution of the tropical and subtropical forest soil profiles in Dinghushan natural reserve (DNR) (23°09′22″ - 23°11′ 30″ N, 112° 30′ 39″ - 1 12° 33′ 41″E), located in the northeast of Zhaoqing, Guangdong Province, have been studied preliminarily in this paper. Wukesong, Qingyunsi and Kengkon soil profiles have been chosen for the investigation which ate at different elevations along the southeast-northwest direction in the middle part of DNR. The vegetation in the Wukesong, Qingyunsi and Kengkon soil profiles are respectively the coniferous and broad-leaf mixed forests, monsoon evergreen broad-leaf forests, and coniferous forests. The measurements of 14C and 13δ13C were carried out respectively using 1 220 Quantulus ultralow-background liquid scintillation spectrometer and Finigen Model-251 mass spectrometer. Soil organic carbon was determined by the sulfdric acid-potassium dichromate method. Soil organic carbons are always involved in soil genesis processes and the soil organic carbons produced in the earlier stage are continuously mixed with those produced in the later stage, the measured 14C ages based on the total soil organic carbons obviously tend to be younger. Hence, the 14C ages of the total soil organic carbons are usually referred as the 14C apparent ages of the soil organic carbons, which can be as the mean residence time under the steady condition. Based on the 14C apparent ages of the forest soils of Wukesong, Qingyunsi and Kengkou profiles in DNR, it was found that the duration of the forest soil genesis process ranged approximately from 500 to 1 000 years. The mean residence times of the total organic carbon in the forest soils may represent the burial ages of the soils. The bases of the Wukesong, Qingyunsi and Kengkou soil profiles, whose maximum 14C apparent ages of the soil organic carbons, are respectively 5 572 ± 94aB. P., 8 663 ± 1 12aB. P. and 2 883 ± 77aB.P., reach parent rocks. The δ13C variations with depth in all three profiles can be divided into two sections. In the first section from the surface (0-5cm) to 40cm layers, the δ13C values have a range over - 27.4‰-- 24.1‰, -- 27.5‰-- 22.2‰ and - 24.4‰-- 20.1‰ respectively for Wukesong, Qingyunsi and Kengkou profiles. The soil organic matter is with a large variability in this section and composed of labile components. Both the δ13C and the soil organic carbon tend to become steady in the second section from 40 to 160cm layers and the soil organic matter is composed of refractory components.The δ13C averages for Wukesong, Qingyunsi and Kengkou profiles are - 24.6‰, - 24.4‰ and - 21.1‰ respectively. The variation feature of the δ13C along the soil profile is intimately associated with the soil respiration. The mean δ13C values in the soil profiles can be used to identify not only C3 and C4 plants but also coniferous and broad-leaf vegetation. |
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| Keywords: | litter of plant soil organic carbon dissolved organic carbon karst effect |
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