文献类型：期刊文献

中文题名：除灌和择伐对马尾松林表层土壤酶活性的短期影响

英文题名：Short-Term Effects of Understory Removal and Selective Cutting on Soil Enzyme Activities of the top soil layer in Pinus massoniana Stands

作者：王晓荣[1,2] 雷蕾[1] 曾立雄[1] 付甜[2] 胡文杰[2] 黄志霖[1] 肖文发[1]

第一作者：王晓荣

机构：[1]中国林业科学研究院森林生态环境与自然保护研究所,国家林业和草原局森林生态环境重点实验室,北京100091;[2]湖北省林业科学研究院,武汉430075

年份：2022

卷号：2

期号：1

起止页码：1-12

中文期刊名：陆地生态系统与保护学报

外文期刊名：Terrestrial Ecosystem and Conservation

基金：中央级公益性科研院所基本科研业务费专项资金(CAFBB2018QB004);湖北省自然科学基金项目(2017CFB694)。

语种：中文

中文关键词：除灌;择伐;土壤酶活性;空间异质性;影响因素;马尾松

外文关键词：understory removal;selective cutting;soil enzyme activities;spatial heterogeneity;influencing factors;Pinus massoniana

分类号：S714.8

摘要：【目的】研究除灌和择伐对马尾松(Pinus massoniana)人工林土壤酶活性空间异质性的影响,了解调控土壤酶活性的主要因素,揭示森林经营与土壤养分循环的关系。【方法】以三峡库区马尾松飞播林为对象,采用对照、除灌、伐除非马尾松、伐除优势马尾松4种处理,利用等距离网格布点法,研究不同营林措施下马尾松林表层土壤(0~10 cm)酶活性空间异质性,并结合林分结构参数和土壤理化性质,采用冗余分析探讨影响土壤酶活性空间变异的主要调控因子。【结果】除灌和择伐均降低了马尾松林土壤β-葡糖苷酶(BG)、酸性磷酸酶(AP)和过氧化物酶(PER)活性,增加了亮氨酸氨基肽酶(LAP)和多酚氧化酶(POX)活性,而伐除优势马尾松显著增加了纤维素二糖水解酶(CB)和N-乙酰基-葡糖苷酶(NAG)活性。除灌和择伐显著增加了土壤酶活性空间变异,且水解酶活性变异程度均高于氧化还原酶。不同营林措施中调控土壤酶活性空间变异的主控因子存在差异,其中对照样地为4 m直径范围内林木平均胸径;除灌样地为4 m直径范围内林木平均胸径和枯落物量;伐除非马尾松样地为土壤总有机碳、全氮、微生物量氮、微生物量碳、土壤水分、碳氮比、3 m和9 m直径范围内林木平均胸径,伐除优势马尾松样地为土壤总有机碳、全氮、轻组有机碳、全磷、微生物量碳、微生物量氮以及2~10 m直径范围内林木平均胸径。【结论】除灌措施下林分结构参数是调控马尾松林土壤酶活性空间变异的主要因素,而择伐措施下林分结构、土壤理化性质及微生物碳氮共同调控着林地土壤酶活性的空间分布。
【Objective】Studying the spatial heterogeneity of soil enzyme activities and detecting the main factors regulating soil enzyme activities in Pinus massoniana stands under different forest management will be of great significance to reveal the effect of forest management on soil nutrient cycle.【Method】In this study,we selected the aerial seeding P.massoniana stands in the Three Gorges Reservoir Area as study sites and conducted the following treatments,control,understory removal management,selective non-P.massoniana cutting management,and selective P.massoniana cutting management.We used an equidistant grid point sampling method to study the spatial heterogeneity of soil enzyme activities in top soil layer(0~10 cm)in different forest management practices.Then we used redundancy analysis combined with stand structural parameters and soil physical and chemical properties to detect the main factors affecting the spatial heterogeneity of soil enzyme activities in different management practices.【Result】Compared to the control plot,the activities ofβ-glucosidase(BG),acid phosphatase(AP)and peroxidase(PER)in soil significantly decreased,while that of leucine amino peptidaseand(LAP)and polyphenol oxidase(POX)increased under the measures of understory removal and selective cutting measures.However,the activities of cellobiohydrolase(CB)and N-acetyl-glucosaminidase(NAG)increased under P.massoniana cutting management.The variation of soil enzyme activity also increased under all three management,and the variation of hydrolase activity was consistently higher than that of oxidoreductase.The main factors that influ-enced the spatial variation pattern varied among different treatments,e.g.,it was mean DBH within the range of 4 m diameter that in-fluenced in the control plot;they were mean DBH within the range of 4 m diameter and litter amount in the understory removal plot;they were total organic carbon,total nitrogen,microbial biomass nitrogen,microbial biomass carbon,water content,carbon/nitrogen ratio and mean DBH within the range of 3 m and 9 m diameter in the non-P.massoniana cutting plot;while they were total organic carbon,total nitrogen,light fraction organic carbon,total phosphorus,microbial biomass nitrogen,microbial biomass carbon and mean DBH within the range of 2 m to 10 m diameter in the P.massoniana cutting plot.【Conclusion】Stand structure parameters were the main factors that affect the spatial variation of soil enzyme activity in understory removal measure,while stand structure,soil physical and chemical properties,as well as microbial carbon and nitrogen together regulated the spatial distribution of soil en-zyme activity in selective cutting measures.