文献类型：期刊文献

中文题名：不同杉木-阔叶树混交林土壤碳氮磷含量及酶活性

英文题名：Soil carbon,nitrogen,phosphorus contents and enzyme activities in different mixed fir and broad-leaved plantations

作者：王焱[1,2] 肖以华[1] 付志高[1] 朱火生[3] 许涵[1] 胡冬南[2] 曾繁助[4] 贲春丽[1]

第一作者：王焱

机构：[1]中国林业科学研究院热带林业研究所,广州510520;[2]江西农业大学林学院,南昌330045;[3]广东省乐昌林场,广东乐昌512219;[4]广东大瑶山省级自然保护区管理处,广东韶关512200

年份：2025

卷号：36

期号：10

起止页码：2909-2919

中文期刊名：应用生态学报

外文期刊名：Chinese Journal of Applied Ecology

收录：;北大核心:【北大核心2023】；

基金：国家重点研发计划项目(2022YFF1303003-06);广东省科技厅林业生态监测网络平台建设项目(2024CG259);广东乐昌大瑶山省级自然保护区森林生物多样性监测能力提升项目(202503);广东珠江三角洲农田防护林生态系统定位观测研究站项目(0144135)资助。

语种：中文

中文关键词：杉阔混交林;土壤碳氮磷含量;土壤酶活性;化学计量比;养分限制

外文关键词：mixed fir and broad-leaved plantation;soil C;N;P content;soil enzyme activity;stoichiometric ratio;nutrient limitation

分类号：S714

摘要：杉(杉木)阔(阔叶树)混交是一种有效提高杉木人工林生产力的管理方式。本研究以广东省乐昌林场营造20年的10个不同杉阔混交林(阔叶树分别为米老排、火力楠、深山含笑、黄樟、红锥、阴香、枫香、乐昌含笑、木荷和观光木)为对象,分析了不同林分土壤有机碳(SOC)、全氮(TN)、全磷(TP)含量及其化学计量比,以及β-1,4-葡萄糖苷酶、β-木糖苷酶、纤维二糖水解酶、β-1,4-N-乙酰基氨基葡萄糖苷酶、亮氨酸氨基肽酶和酸性磷酸酶活性及其化学计量特征,并解析不同杉阔混交林土壤养分及微生物代谢限制情况。结果表明:1)在0~10和10~30 cm土层,SOC和TN含量最高的均是火力楠,在30~50 cm土层含量最高的是木荷;TP含量在3个土层中含量最高的均是阴香。10种林分土壤SOC、TN含量均随土层深度增加而降低,TP含量则不受土层深度的影响。2)10种林分类型SOC、TN、TP含量分别为4.82~32.69、0.50~2.16和0.24~0.55 g·kg^(-1),仅火力楠和木荷SOC和TN含量达到全国平均水平,而所有林分TP含量均低于全国平均水平。3)酶计量矢量模型结果表明,土壤微生物代谢受到氮、磷的共同限制。4)冗余分析显示,TN、有效磷(AP)、NH_(4)^(+)-N、土壤含水量(SWC)、pH、TP是影响土壤酶活性的主要因子,pH、AP、TP、SWC、C∶P是影响土壤酶化学计量比的主要因子。综上,火力楠和木荷与杉木混交在改进土壤养分方面效果较好,是南亚热带杉木人工林混交改造的优选树种,研究区土壤氮、磷养分较匮乏,在后续经营管理中应增加外源氮、磷的投入。
Mixed planting of fir and broadleaf trees is an effective management method for improving the productivity.We investigated soil organic carbon(SOC),total nitrogen(TN),and total phosphorus(TP)contents,along with their stoichiometric ratios across 10 different combinations of Chinese fir and broadleaf species(Mytilaria laosensis,Michelia macclurei,Michelia maudiae,Cinnamomum porrectum,Castanopsis hystrix,Cinnamomum burmanni,Liquidambar formosana,Michelia chapensis,Schima superba,and Michelia odora,respectively)with the stand age of 20 yr.Additionally,we examined the activities and stoichiometric characteristics of various enzymes:β-1,4-glucosidase,β-xylosidase,cellobiohydrolase,β-1,4-N-acetylaminoglucosidase,leucine aminopeptidase,and acid phosphatase to analyze nutrient limitation status in different mixed stands.The results showed that:1)In the 0-10 cm and 10-30 cm soil layers,the highest SOC and TN contents were found in M.macclurei,whereas in the 30-50 cm soil layer,the highest contents were observed in S.superba.The highest TP content across all three soil layers was recorded in C.burmanni.Soil SOC and TN contents of the 10 forest stands decreased with the soil depth,while TP was not affected by the soil depth.2)The measured ranges across the 10 stand types were 4.82-32.69 g·kg^(-1) for SOC,0.50-2.16 g·kg^(-1) for TN,and 0.24-0.55 g·kg^(-1) for TP,indicating nutrient deficiency.Only the stands of M.macclurei and S.superba reached national average levels for SOC and TN,while the TP content of all forest stands was below the national average.3)The results of the enzyme quantification vector model indicated that soil microbial metabolism was jointly limited by nitrogen and phosphorus.4)Redundancy analysis revealed that TN,available phosphorus(AP),ammonium(NH_(4)^(+)-N),soil water content(SWC),pH,and TP were the primary factors influencing enzyme activities.Additionally,pH,AP,TP,SWC,and the carbon-to-phosphorus(C:P)ratio emerged as key determinants of enzymatic stoichiometry.In summary,M.macclurei and S.superba were effective in promoting soil nutrient levels in mixed forests of fir and broadleaf trees,being the optimal tree species for the mixed forest renovation in the South subtropical region.Given the prevalent limitations of nitrogen and phosphorus,external nitrogen and phosphorus inputs should be considered in future management practices.