| 不同林龄马尾松人工林土壤碳氮磷生态化学计量特征 |
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| 引用本文： | 雷丽群,卢立华,农友,明安刚,刘士玲,何远.不同林龄马尾松人工林土壤碳氮磷生态化学计量特征[J].林业科学研究,2017,30(6):954-960. |
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| 作者姓名： | 雷丽群 卢立华 农友 明安刚 刘士玲 何远 |
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| 作者单位： | 中国林业科学研究院热带林业实验研究中心, 广西 凭祥 532600;广西友谊关森林生态系统国家定位观测研究站, 广西 凭祥 532600,中国林业科学研究院热带林业实验研究中心, 广西 凭祥 532600;广西友谊关森林生态系统国家定位观测研究站, 广西 凭祥 532600,中国林业科学研究院热带林业实验研究中心, 广西 凭祥 532600;广西友谊关森林生态系统国家定位观测研究站, 广西 凭祥 532600,中国林业科学研究院热带林业实验研究中心, 广西 凭祥 532600;广西友谊关森林生态系统国家定位观测研究站, 广西 凭祥 532600,中国林业科学研究院热带林业实验研究中心, 广西 凭祥 532600;广西友谊关森林生态系统国家定位观测研究站, 广西 凭祥 532600,中国林业科学研究院热带林业实验研究中心, 广西 凭祥 532600;广西友谊关森林生态系统国家定位观测研究站, 广西 凭祥 532600 |
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| 基金项目： | 中国林业科学研究院基本科研业务费专项资金项目（CAFYBB2014QA033）、广西林业科技项目（桂林科字[2016]第37号）、中国林业科学研究院热带林业实验中心主任基金项目（RL2015-04） |
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| 摘 要： | 目的]研究了马尾松从幼龄林至成熟林生长序列中的土壤有机C、全N、全P含量及其生态化学计量特征,以丰富该区域马尾松生态系统生态化学计量学领域的基础研究。方法]以广西凭祥4个林龄(6、16、23、35 a)马尾松人工林为研究对象,每个林龄选取3块林分,每个林分内设置一个400 m2的调查样地,按照0 20、20 40、4060 cm三层土层取样,采用不同林分土壤化学计量的对比实验测定土壤CNP,采用单因素方差分析的LSD法进行显著性检验。结果]表明:4个林龄马尾松人工林0 20 cm土壤有机C、全N、全P含量分别为5.73 15.56、0.691.23、0.17 0.23 g·kg-1,是20 40 cm土层的1.51、1.31、1.06倍,40 60 cm土层的1.97、1.58、1.06倍。土壤有机C含量、全N含量均随林龄的递增先降低后增加,随土层加深持续降低;土壤全P含量在林龄和土层间均无显著性变化;林龄对土壤C∶N、N∶P有极显著的影响(P=0.001,P=0.000),土层对土壤C∶P、N∶P有显著性影响(P=0.000,P=0.014)。结论]土壤有机C、全N含量从成熟林阶段开始回升;N在不同林龄间和不同土层间的变化是土壤N∶P变化的主要原因;土壤C∶N、C∶P主要受有机C的影响。
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| 关 键 词： | 马尾松人工林 林龄 碳氮磷 生态化学计量 |
| 收稿时间： | 2017/2/22 0:00:00 |
Stoichiometry Characterization of Soil C, N and P of Pinus massoniana Plantations at Different Age Stages |
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| LEI Li-qun,LU Li-hu,NONG You,MING An-gang,LIU Shi-ling and HE Yuan.Stoichiometry Characterization of Soil C, N and P of Pinus massoniana Plantations at Different Age Stages[J].Forest Research,2017,30(6):954-960. |
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| Authors: | LEI Li-qun LU Li-hu NONG You MING An-gang LIU Shi-ling and HE Yuan |
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| Institution: | Experimental Center of Tropical Forestry, Chinese Academy of Forestry, Pingxiang 532600, Guangxi, China;Guangxi Youyiguan Forest Ecosystem Research Station, Pingxiang 532600, Guangxi, China,Experimental Center of Tropical Forestry, Chinese Academy of Forestry, Pingxiang 532600, Guangxi, China;Guangxi Youyiguan Forest Ecosystem Research Station, Pingxiang 532600, Guangxi, China,Experimental Center of Tropical Forestry, Chinese Academy of Forestry, Pingxiang 532600, Guangxi, China;Guangxi Youyiguan Forest Ecosystem Research Station, Pingxiang 532600, Guangxi, China,Experimental Center of Tropical Forestry, Chinese Academy of Forestry, Pingxiang 532600, Guangxi, China;Guangxi Youyiguan Forest Ecosystem Research Station, Pingxiang 532600, Guangxi, China,Experimental Center of Tropical Forestry, Chinese Academy of Forestry, Pingxiang 532600, Guangxi, China;Guangxi Youyiguan Forest Ecosystem Research Station, Pingxiang 532600, Guangxi, China and Experimental Center of Tropical Forestry, Chinese Academy of Forestry, Pingxiang 532600, Guangxi, China;Guangxi Youyiguan Forest Ecosystem Research Station, Pingxiang 532600, Guangxi, China |
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| Abstract: | Objective] To investigate the concentrations and stoichiometric ratio of soil organic C, total N and P in Pinus massoniana plantations from young to mature stages in order to enrich the basic research of P. massoniana ecosystem in stoichiometric field. Method] Four P. massoniana plantations at different ages (6-, 16-, 23-and 35-year-old) in Pingxiang of Guangxi were selected as the research object, three plots in size of 400 m2 were set up for each of the plantations. The soil samples were collected from 0-20, 20-40, 40-60 cm depths respectively for measuring organic C, total N and total P, the ratio among them was estimated. The LSD method was used to test the significance of single factor. Result] The contents of soil organic C, total N and total P in 0-20 cm soil layer of P. massoniana plantation were 5.73-15.56 g·kg-1, 0.63-1.23 g·kg-1 and 0.17-0.33 g·kg-1, which are 1.51, 1.31, and 1.06 times of that in 20~40 cm soil layer, and 1.97, 1.58, 1.06 times of that in 40~60 cm soil layer, respectively. The concentrations of soil organic C and total N increased at initial and then decreased as the stand age increased, while decreased with the increasing soil depth. No significant difference was found in the soil total P among different stand age and soil depth. Stand age have statistically significant effect on soil C:N and N:P (P=0.001, P=0.000), the soil layer has significant effect on soil C:P and N:P (P=0.000, P=0.014). Conclusion] The contents of soil organic C and total N begin to pick up from the mature stage. The change of N among different stand age and soil depth is the key factor changing soil N:P ratio. The ratio of soil C:N and C:P is mainly affected by organic C. |
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| Keywords: | Pinus massoniana plantation stand age CNP stoichiometry |
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