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甜龙竹种植年限对土壤团聚体稳定性及有机质组分的影响

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  • 国家科技期刊平台
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土壤团聚体的数量和分布特征是土壤稳定性的反映.土壤团聚体有机质与土壤的稳定性密切相关.探究植物不同种植年限对土壤团聚体及有机质的影响,揭示团聚体稳定性与有机质之间的相关性,对提高土壤肥力和水土保持能力具有重要意义.以不同种植年限(5、10、20、40 a)的甜龙竹林为研究对象,采用空间尺度代替时间尺度的方法,比较不同种植年限的土壤团聚体分布特征及其平均质量直径(MWD)、几何平均直径(GMD)、分形维数(D)等稳定性指标,同时测定土壤有机质含量及其腐殖质与碳水化合物含量,分析其与团聚体稳定性的相关性.结果显示:1)甜龙竹林土壤团聚体分布特征在不同种植年限间的差异达显著水平,相同种植年限中不同粒径团聚体分布呈"V"字型,以<0.25 mm和≥5mm 的粒径为主;2)甜龙竹不同种植年限对土壤团聚体稳定性有显著影响,当种植年限为 10a时,浅层土(0～20 cm)土壤团聚性最好,稳定性最高,D值最小;当延长种植年限达到40a时,深层土(20～40 cm和40～60 cm)的各项指标最优.3)土壤有机质含量及其组分含量随着种植年限的延长呈现上升趋势,有机质含量与土壤团聚体稳定性的相关性最强.4)3 种土壤碳水化合物提取方式(热水、浓酸、稀酸)所提取的碳水化合物质量分数差异显著,其中浓酸提取的效率最高,与土壤稳定性的相关性表现为浓酸>稀酸>热水.研究表明,适当延长甜龙竹种植年限(10a以上)有利于提高土壤团聚体的稳定性.
Effects of Planting Duration of Dendrocalamus brandisii on Soil Aggregate Stability and Organic Matter Composition
The quantity and distribution characteristics of soil aggregates are a reflection of soil stability,and the organic matter in soil aggregates is closely related to soil stability.It is of great significance to investigate the effect of different planting durations on soil aggregates and their organic matters,and to reveal the correlation between aggregate stability and organic matter,in order to improve soil fertility and soil and water conservation.The study is carried out in Dendrocalamus brandisii forests with different planting durations(5a,10a,20a,40a)to compare the distribution characteristics as well as mean weight diameter(MWD),geometric mean diameter(GMD),and fractal dimension(D)of soil agglomerates in different planting duration by using the spatial scale method as a substitute of temporal scale,measure and determine the content of organic matters and the contents of its humus and carbohydrate in soil,and analyze their correlation with soil aggregates stability.The results show that:1)The distribution characteristics of soil aggregates in D.brandisii forests with different planting durations are significantly different,and aggregates with different particle sizes and the same planting duration are in a"V"shape,dominated by the particle size of<0.25 mm and>5 mm;2)The planting duration of D.brandisii forest has a significant effect on the stability of soil aggregates.When the planting duration is 10a,the soil aggregation is the best in the shallow soil layer(0-20 cm),with the highest stability and the smallest D value;when the planting duration is extended to 40a,the deep soil layers(20-40 cm and 40-60 cm)have the best performance for all indicators;3)The contents of organic matter and its component present an increasing trend with the extension of planting duration,and the correlation between organic matter content and soil aggregates stability is the strongest;and 4)There is a significant difference in the concentration of carbohydrates extracted in three different ways,in which the extraction efficiency of concentrated acid is the highest,and the correlation with soil stability is ordered by concentrated acid>dilute acid>hot water.The research indicates that appropriate extension of the plantation duration beyond 10 years is beneficial to improving the stability of soil aggregates.

Dendrocalamus brandisiiplanting durationsoil aggregateaggregates stabilitysoil propertysoil organic matter

刘佳林、刘蔚漪、赵秀婷、辉朝茂、朱书红

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西南林业大学林学院 竹藤科学研究院/丛生竹工程技术研究中心 昆明 650224

甜龙竹 种植年限 土壤团聚体 团聚体稳定性 土壤性质 土壤有机质

国家重点研发计划项目云南省基础研究专项云南滇南竹林生态系统定位观测研究站监测经费项目西南林业大学竹藤科学研究院运行经费项目

2021YFD2200501202201AT0700532022-YN-15

2024

10.12168/sjzttx.2023.12.27.001

世界竹藤通讯
中国林业科学研究院 林业科技信息研究所

世界竹藤通讯

影响因子：0.338
ISSN：1672-0431
年,卷(期)：2024.22(1)
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