Converting paddy fields to Lei bamboo (Phyllostachys praecox) stands affected soil nutrient concentrations, labile organic carbon pools, and organic carbon chemical compositions
Converting paddy fields to Lei bamboo (Phyllostachys praecox) stands affected soil nutrient concentrations, labile organic carbon pools, and organic carbon chemical compositions
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DOI：
10.1007/s11104-012-1551-6
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发表时间：
2013-06
期刊：
影响因子：
4.9
通讯作者：
Tao Zhang;Yongfu Li;Scott X. Chang;Peikun Jiang;Guomo Zhou;Juan Liu;Lin Lin-Lin
中科院分区：
文献类型：
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作者：
Tao Zhang;Yongfu Li;Scott X. Chang;Peikun Jiang;Guomo Zhou;Juan Liu;Lin Lin-Lin
背景和目的土地利用变化往往显著改变土壤碳(C)和氮(N)池的大小，从而影响气候变化和土壤可持续性。本研究旨在研究稻田还雷竹对土壤C、N等养分库的影响，以及土壤剖面中有机碳(SOC)的化学结构。方法从浙江省临安县采集了4个已知土地利用历史的相邻水田-竹林对土壤。测定了土壤水溶态有机碳(WSOC)、热水溶态有机碳(HWSOC)、微生物量碳(MBC)、易氧化碳(ROC)、水溶性有机氮(WSON)等土壤理化性质。结果随着土地利用方式的改变，土壤速效磷、速效钾和不同形态氮的含量增加(P<； 0.05)。竹林下层(20~40和40~60 cm土层)土壤有机碳和全氮(TN)含量高于水田，而表层(0~20 cm土层)无明显变化。土地利用变化后，整个土壤剖面(0~60 cm)土壤有机碳和全氮储量分别增加了56.7%和70.7%。三个土层的有机碳储量分别增加了11.0、14.3和9.5mgC ha−1。转化降低了底层土壤中的WSOC浓度，但增加了表层土壤中的ROC浓度。土壤样品的固体核磁共振波谱分析表明，稻田还林还林提高了土壤邻烷基碳含量，降低了芳香烃C含量、烷基C太烷基C比(A/O-A)和有机碳芳香度。结论稻田还林还竹增加了土壤养分有效性，增加了土壤有机碳和全氮储量。土地利用变化对土壤有机碳碳库和碳化学的影响因土壤剖面不同土层而异。土地利用转换对土壤有机碳库的影响不仅限于表土，下层土壤的变化也同样大，应予以考虑。
Background and aimsLand-use change often markedly alters soil carbon (C) and nitrogen (N) pool sizes with implications for climate change and soil sustainability. The objective of this research was to study the effect of converting paddy fields to Lei bamboo (Phyllostachys praecox) stands on soil C and N and other nutrient pools as well as the chemical structure of soil organic C (SOC) in the soil profile.MethodsSoils (Anthrosols) from four adjacent paddy field–bamboo forest pairs with a known land-use history were sampled from Lin’an County, Zhejiang Province. Soil water soluble organic C (WSOC), hot water soluble organic C (HWSOC), microbial biomass C (MBC), readily oxidizable C (ROC), water soluble organic N (WSON), and other soil chemical and physical properties were determined. Soil organic C functional group compositions were determined by13C-nuclear magnetic resonance (NMR).ResultsConcentrations of soil available P, available K, and different N forms increased (P< 0.05) by the land-use conversion. Higher concentrations of SOC and total N (TN) were observed in the subsoil (20–40 and 40–60 cm soil layers) but not in the topsoil (0–20 cm layer) in the bamboo stands than in the paddy fields. The storage of SOC and TN in the entire soil profile (0–60 cm) increased by 56.7 and 70.7 %, respectively, after the land-use change. The increases in the SOC stock of the three soil layers were 11.0, 14.3, and 9.5 Mg C ha−1, respectively. The conversion decreased WSOC concentrations in the subsoil but increased the ROC concentration in the topsoil. Solid-state NMR spectroscopy of soil samples showed that the conversion increased (P< 0.05) theO-alkyl C content while decreased the aromatic C content, alkyl C toO-alkyl C ratio (A/O-A), and aromaticity of SOC.ConclusionsConversion of paddy fields to bamboo stands increased soil nutrient availability, and SOC and TN stocks. Effects of land-use change on C pools and C chemistry of SOC varied among different soil layers in the profile. The impact of the land-use conversion on soil organic C pools was not restricted to the topsoil, but changes in the subsoil were equally large and should be accounted for.