| 不同龄级橡胶林土壤有机碳组分及其影响因素 |
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| 引用本文： | 赵林林,吴志祥,孙瑞,杨川,符庆茂,谭正洪.不同龄级橡胶林土壤有机碳组分及其影响因素[J].南方农业学报,2021,52(6):1595-1603. |
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| 作者姓名： | 赵林林 吴志祥 孙瑞 杨川 符庆茂 谭正洪 |
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| 作者单位： | 中国热带农业科学院橡胶研究所,海口 571101;海南大学热带作物学院,海口 570228;农业农村部儋州热带作物科学观测实验站,海南儋州 571737;中国热带农业科学院橡胶研究所,海口 571101;农业农村部儋州热带作物科学观测实验站,海南儋州 571737;海南大学生态与环境学院,海口 570228 |
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| 基金项目： | 海南省自然科学基金高层次人才项目（2019RC330，2019RC335）；现代农业产业技术体系建设专项（CARS-33-ZP3） |
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| 摘 要： | 【目的】对比分析不同龄级橡胶林土壤各组分碳含量及影响因素，为云南省乃至我国植胶区土壤质量和天然橡胶产业的高效发展提供理论依据。【方法】以西双版纳景洪农场九分场为采样地，选取5种龄级（2、10、16、27和34a）橡胶林不同土层土壤样品为试验样本，测定土壤主要理化性质及土壤有机碳各组分含量，采用单因素方差分析、相关分析等方法分析不同龄级、不同土层（0~10 cm、10~20 cm和20~40 cm）间土壤有机碳各组分的差异及影响因素。【结果】5种不同龄级橡胶林的土壤理化性质存在差异，土壤pH在2.59~4.47，含水量在17.48%~40.38%，土壤容重在0.99~1.40 g/cm，全氮含量在0.75~1.37 g/kg，全磷含量在0.45~1.68 g/kg，全钾含量在1.70~22.71 g/kg。不同龄级橡胶林的土壤有机碳组分含量存在差异，土壤总有机碳含量在7.51~20.13 g/kg；易氧化有机碳含量在2.81~7.20 g/kg，占土壤总有机碳含量的13.96%~95.87%；稳定态有机碳含量在1.82~4.69 g/kg，占土壤总有机碳含量的9.04%~62.45%；水溶性有机碳含量在0.23~0.52 g/kg，占土壤总有机碳含量的1.14%~6.92%。土壤有机碳组分在不同土层中的变化规律相似，即随着土层深度增加各组分碳含量下降，表现为0~10 cm>10~20 cm>20~40 cm。相关分析结果表明，土壤有机碳各组分关系密切，总有机碳含量与易氧化有机碳和稳定态有机碳含量呈极显著正相关（P<0.01，下同），与水溶性有机碳含量相关程度不显著（P>0.05，下同）；土壤理化特性对土壤有机碳组分的影响有所不同，土壤总有机碳含量与土壤含水量、全磷含量、全钾含量均呈极显著正相关，与全氮含量呈显著正相关（P<0.05，下同），与土壤pH、土壤容重呈显著负相关；易氧化有机碳含量与土壤含水量及全磷和全钾含量呈极显著正相关，与土壤容重、pH呈极显著负相关；稳定态有机碳含量与全磷和全钾含量呈显著正相关，与土壤容重、土壤含水量呈显著负相关；水溶性有机碳含量仅与全钾含量、土壤pH呈显著正相关，与其余指标的相关性不显著。【结论】不同龄级橡胶林土壤有机碳各组分间相关性较强，且土壤pH、土壤容重、土壤含水量及全氮、全磷和全钾含量均是影响土壤有机碳各组分含量的重要因子，各理化指标间存在密切的相互制约、相互促进关系。
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| 关 键 词： | 橡胶林 土壤总有机碳 易氧化有机碳 稳定态有机碳 水溶性有机碳 |
| 收稿时间： | 2020-10-26 |
Soil organic carbon composition and its influencing factors in rubber plantation of different ages |
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| ZHAO Lin-lin,WU Zhi-xiang,SUN Rui,YANG Chuan,FU Qing-mao,TAN Zheng-hong.Soil organic carbon composition and its influencing factors in rubber plantation of different ages[J].Journal of Southern Agriculture,2021,52(6):1595-1603. |
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| Authors: | ZHAO Lin-lin WU Zhi-xiang SUN Rui YANG Chuan FU Qing-mao TAN Zheng-hong |
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| Affiliation: | 1. Rubber Research Institute, Chinese Academy of Tropical Agricultural Sciences, Haikou 571101, China;2. Institute of Tropical Crops, Hainan University, Haikou 570228, China;3. Danzhou Investigation & Experiment Station of Tropical Crops, Ministry of Agriculture and Rural Affairs, Danzhou, Hainan 571737, China;4. College of Ecology and Environment, Hainan University, Haikou 570228, China |
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| Abstract: | 【Objective】The carbon content and influencing factors of soil components in different age classes of rubber forest were compared and analyzed, so as to provide a theoretical basis for the soil quality in Yunnan and even China's rubber planting areas and the efficient development of natural rubber industry.【Method】Taking the ninth branch of Jinghong farm in Xishuangbanna as the sampling site, the soil samples of different soil layers of rubber forest of five age classes(2, 10, 16, 27 and 34 a) were selected as the test samples. Main physical and chemical properties and each component content of soil organic carbonwere measured, single factor analysis of variance and correlation analysis were used to analyze the differences and influencing factors of soil organic carbon components in different age classes and different soil layers(0-10 cm, 10-20 cm, 20-40 cm).【Result】The soil physical and chemical properties of five different age classes of rubber forest were different. The soil pH was 2.59-4.47, the water content was 17.48%-40.38%, the soil bulk density was 0.99-1.40 g/cm, the total nitrogen was 0.75-1.37 g/kg, the total phosphorus was 0.45-1.68 g/kg, and the total potassium content was 1.70-22.71 g/kg. The content of soil organic carbon components in 5 rubber forests of different ages varied, among which the total soil organic carbon content ranged from 7.51-20.13 g/kg. The content of readily oxidized carbon ranged from 2.81-7.20 g/kg, accounting for 13.96%-95.87% of the total organic carbon content in soil. The content of stable organic carbon ranged from 1.82-4.69 g/kg, accounting for 9.04%-62.45% of the total soil organic carbon content.The content of water-soluble organic carbon ranged from 0.23-0.52 g/kg, accounting for 1.14% to 6.92% of the total soil organic carbon content. The variation law of soil organic carbon components in different soil layers was similar, that was, with the increase of soil depth, the carbon content of each component decreased, which was 0-10 cm>10-20 cm>20-40 cm.The results of correlation analysis showed that the components of soil organic carbon were closely related. Total organic carbon had extremely significant positive correlation with easily oxidized organic carbon and stable organic carbon(P<0.01, the same below), but had no significant correlation with water-soluble organic carbon(P>0.05, the same below).Soil physical and chemical characteristics had different effects on soil organic carbon components. Soil total organic carbon had extremely significant positive correlation with soil water content, total phosphorus content and total potassium content, and significant positive correlation with total nitrogen content(P<0.05, the same below), and significant negative correlation with soil pH and soil bulk density. Easily oxidized organic carbon was extremely positively correlated with soil water content, total phosphorus content and total potassium content, and extremely negatively correlated with soil bulk density and pH. Stable organic carbon was significantly positively correlated with total phosphorus content and total potassium content, and negatively correlated with soil bulk density and soil water content. Water soluble organic carbon was significantly positively correlated with total potassium content and soil pH, but not with other indicators.【Conclusion】There is strong correlation between the components of soil organic carbon in rubber forest of different age classes, and soil pH, soil bulk density, soil water content and the contents of total nitrogen, total phosphorus and total potassium are important factors affecting the contents of soil organic carbon components. There is a close mutual restriction and promotion relationship among the physical and chemical indexes. |
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