间伐对马尾松人工林土壤活性氮组分的影响

发布时间：2018-04-30 06:08

本文选题：间伐 + 马尾松人工林　；参考：《西北农林科技大学学报(自然科学版)》2017年12期

【摘要】：【目的】研究实施不同强度间伐后的马尾松(Pinus massoniana Lamb.)人工林土壤活性氮组分在各季节的变化规律,以明晰间伐对土壤活性氮的影响程度,为确定适宜的间伐强度及森林土壤氮素管理提供科学依据。【方法】以南京市溧水区林场2006年实施不同强度(弱度25%,中度45%,强度65%)间伐的29年生马尾松人工林为研究对象,以未间伐为对照,于2015年4,7,10,12月采集不同处理0~10和10~20cm土层土样,测定不同土层4种活性氮组分(可溶性有机氮(DON)、微生物生物量氮(MBN)、铵态氮(NH+4-N)、硝态氮(NO-3-N))的含量,分析不同间伐强度对土壤活性氮组分的影响。【结果】各活性氮组分含量存在一定的季节差异性,DON、MBN和NO-3-N含量在夏季均较低,NH+4-N含量在夏季和秋季时较高。活性氮组分对间伐的响应存在一定的季节差异。与对照样地相比,各间伐强度显著(P0.05)降低了春季和冬季土壤的DON含量,提高了夏季和秋季土壤的DON含量。弱度和中度间伐显著(P0.05)提高了各季节土壤MBN含量;强度间伐显著(P0.05)提高了春季和冬季土壤MBN含量,降低了夏季和秋季土壤MBN含量。各间伐强度显著(P0.05)提高了春季和夏季土壤的NH+4-N含量,降低了秋季土壤的NH+4-N含量;对冬季土壤NH+4-N含量的影响不一致,弱度间伐显著(P0.05)升高,中度间伐显著(P0.05)降低,强度间伐影响不显著。与对照样地相比,弱度和中度间伐显著(P0.05)增加了春季土壤NO-3-N含量,降低了秋冬季土壤NO-3-N含量,弱度间伐对夏季土壤的NO-3-N含量无显著影响,中度间伐显著(P0.05)提高夏季土壤NO-3-N含量;强度间伐显著(P0.05)提高春季土壤NO-3-N含量,降低夏季和冬季土壤的NO-3-N含量,对秋季土壤NO-3-N含量无显著影响。【结论】各间伐强度对土壤活性氮组分的含量均有一定影响,中度间伐可促进土壤活性氮组分的有效利用,为提高土壤氮素有效性,以实施中度间伐为宜。
[Abstract]:[objective] to study the effect of different intensity thinning on Pinus massoniana Lamb. In order to clarify the influence of thinning on soil active nitrogen, the variation of soil active nitrogen components in different seasons of artificial forest was studied. In order to provide scientific basis for determining suitable thinning intensity and forest soil nitrogen management. [methods] Twenty-nine year old Pinus massoniana plantations with different intensity (weak degree 25, moderate 45, intensity 65%) implemented in Lishui District Forest Farm in Nanjing in 2006 were taken as the research object. Four active nitrogen components (soluble organic nitrogen), microbial biomass nitrogen (MBN), ammonium nitrogen (NH _ 4-N _ 4), nitrate nitrogen (no _ 3-N _ (3) were collected from different soil layers in December, using non-thinning as control, and soil samples of different treatments (0n10 and 10~20cm) were collected in December, respectively, and the contents of four active nitrogen components (soluble organic nitrogen), microbial biomass nitrogen (MBN), ammonium nitrogen (NH _ 4-N), nitrate nitrogen (no _ 3-N) were determined. The effects of different thinning intensities on soil active nitrogen components were analyzed. [results] there were certain seasonal differences in the contents of active nitrogen components in soil. The contents of DON-MBN and NO-3-N in summer were lower than those in summer. The contents of NH _ 4-N were higher in summer and autumn. There were seasonal differences in the response of active nitrogen components to thinning. The soil DON content in spring and winter was decreased, and the DON content in summer and autumn was increased. Weak and moderate thinning significantly increased soil MBN content in different seasons, and intensity thinning significantly increased soil MBN content in spring and winter, and decreased soil MBN content in summer and autumn. The soil NH _ 4-N content in spring and summer was increased, the NH _ 4-N content in autumn soil was decreased, the effect on soil NH _ 4-N content in winter was not consistent, the weak thinning was significantly increased (P _ (0.05), the moderate thinning was significantly decreased (P _ (0.05), the soil NH _ 4-N content in spring and summer was increased significantly (P _ (0.05), and the soil NH _ 4-N content in autumn was decreased. The effect of intensity thinning was not significant. Compared with the control land, weak and moderate thinning significantly increased soil NO-3-N content in spring, decreased soil NO-3-N content in autumn and winter, weak thinning had no significant effect on NO-3-N content in summer, moderate thinning significantly increased NO-3-N content in summer soil. Intensity thinning significantly increased soil NO-3-N content in spring, decreased soil NO-3-N content in summer and winter, but had no significant effect on soil NO-3-N content in autumn. [conclusion] each thinning intensity has certain effect on soil active nitrogen content. Moderate thinning can promote the effective utilization of soil active nitrogen components, in order to improve the availability of soil nitrogen, it is appropriate to implement moderate thinning.
【作者单位】：南方现代林业协同创新中心;南京林业大学生物与环境学院;
【基金】：国家重点基础研究发展计划(“973”计划)子专题(2012CB416904)
【分类号】：S714

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