摘要
在福建省大鹤国有防护林场选取立地条件和营林方式相似,林分年龄为8年生,密度分别为25000、30000、35000和40000株·hm^(-2)的米筛竹林为研究对象.采用模糊数学和多元统计分析方法,研究不同密度下竹林土壤养分和酶活性等11个土壤质量指标差异,并计算各密度梯度米筛竹林土壤质量综合指数,对土壤质量进行综合评价.结果表明:随着林分密度增大,全氮和有效磷含量先增加后减少,碱解氮和速效钾含量先减少后增加,全磷含量逐渐减少,全钾含量则逐渐增加;随着林分密度增大,脲酶活性先升高后趋于平稳,蔗糖酶和酸性磷酸酶先升高后降低,蛋白酶活性则变化不明显;除全钾、速效钾和蛋白酶活性与各指标的相关性较差外,其他土壤指标间普遍存在显著(P<0.05)相关性.综合分析结果表明,30000株·hm^(-2)密度林分土壤质量综合指数最高(0.6057),土壤养分积累和土壤酶活性均处于较优水平.因此,认为沿海沙地米筛竹林经营的最优密度为30000株·hm^(-2).
To provide scientific reference for sustainable forest management regarding stand density in coastal sandy region,Dahe National Shelter Forest Farm of Fujian Province was chosen as the experimental site.Soil quality under different densities of Bambusa pachinensis(25000,30000,35000 and 40000 individual·hm^(-2))were evaluated based on 11 indicators concerning soil nutrient contents and enzyme activities,then the results were subject to fuzzy mathematics and multivariate statistical analysis.Comprehensive soil quality index was further worked out to rate the soil quality under different planting densities.The results showed that the contents of total nitrogen and available phosphorus firstly increased and then dropped along with increasing stand densities,while the contents of available nitrogen and available potassium started with declines and then rebound.Total phosphorus levels continuously decreased while total potassium maintained uprising trends when stand density increased.Urase activity firstly increased and then plateaued despite of elevated stand density,sucrase and acid phosphatase activity firstly increased and then went down,nevertheless protease activity remained almost unchanged despite of rising planting densities.Correlation analysis showed that except for the poor correlations between total potassium,available potassium and protease activity,there were significant correlations between other nutrient indexes and soil enzyme activities(P<0.05).Comprehensive analysis showed that comprehensive soil quality index peaked(0.6057)when B.pachinensis was planted at the density of 30000 individual·hm^(-2),with soil nutrient accumulation and enzyme activities maintaining at the optimal level.Therefore,B.pachinensis is recommended to be planted at the density of 30000 individual·hm^(-2) for the sake of soil quality and sustainable forest development.
作者
黄丽婷
陈晓云
邓智文
陈乾
林宇
荣俊冬
郑郁善
苏小青
HUANG Liting;CHEN Xiaoyun;DENG Zhiwen;CHEN Qian;LIN Yu;RONG Jundong;ZHENG Yushan;SU Xiaoqin(College of Forestry,Fujian Agriculture and Forestry University,Fuzhou,Fujian 350002,China;Changle Dahe National Shelter Forest Farm of Fujian Province,Fuzhou,Fujian 350002,China)
出处
《福建农林大学学报（自然科学版）》
CSCD
北大核心
2021年第4期510-516,共7页
Journal of Fujian Agriculture and Forestry University:Natural Science Edition
基金
福建农林大学科技创新专项(CXZX2017089)
福建省区域发展项目(2015N3015).
关键词
沿海沙地
米筛竹
林分密度
土壤质量
coastal sandy land
Bambusa pachinensis
stand density
soil quality
