干扰/利用方式对喀斯特石灰土团聚体分布及其碳氮含量的影响

生态学杂志

干扰/利用方式对喀斯特石灰土团聚体分布及其碳氮含量的影响

肖霜霜^1,2,3,叶莹莹^1,2,3,张伟^1,2,吴敏^1,2,3,王克林^1,2*#br#

（¹中国科学院亚热带农业生态研究所，亚热带农业生态过程重点实验室，长沙 410125； ^2中国科学院环江喀斯特生态系统观测研究站，广西环江 547100； ^3中国科学院大学，北京 100049）

出版日期:2016-05-10 发布日期:2016-05-10

Carbon and nitrogen contents in calcareous soil aggregates affected by disturbance and land use in karst region, China.

XIAO Shuang-shuang^1,2,3, YE Ying-ying^1,2,3, ZHANG Wei^1,2, WU Min^1,2,3, WANG Ke-lin^1,2*#br#

(¹Key Laboratory of Subtropical Agriculture Ecology, Institute of Subtropical Agriculture, Chinese Academy of Sciences, Changsha 410125, China; ²Huan
jiang Observation and Research Station for Karst Ecosystems, Chinese Academy of Sciences, Huanjiang 547100, Guangxi, China; ³University of Chinese Academy of Sciences, Beijing 100049, China).

Online:2016-05-10 Published:2016-05-10

摘要/Abstract

摘要： 基于长期控制实验，研究了干扰/利用方式（封育、砍伐、火烧，种植牧草和种植玉米等5种处理方式）对典型喀斯特地区石灰土团聚体分布及团聚体碳、氮含量的影响，结果发现：各干扰/利用方式土壤团聚体组成都以>5和2~5 mm粒级为主，其中封育和砍伐地>5 mm粒级团聚体含量显著高于其他3种方式，火烧和玉米地则在<2 mm的4种小粒级团聚体含量呈现较高值；全土和团聚体中有机碳和总氮含量基本以封育最高，砍伐、火烧居中，而以牧草和玉米地最低；各干扰/利用方式下团聚体有机碳分布规律不同，随团聚体粒级减小，封育和砍伐地呈波浪形分布，玉米地呈倒“V”形分布，团聚体总氮分布较平稳，团聚体碳、氮在0.054～0.25 mm均呈现最低值；封育和砍伐处理的>5 mm团聚体碳、氮占全土含量和贡献率显著高于其他3种处理，且各干扰/利用方式土壤团聚体碳、氮主要存在于>5 mm和2～5 mm粒级（均为60%～82%），可将>2 mm粒级团聚体作为喀斯特山区土壤碳、氮固持的特征团聚体。

关键词: 抗氧化系统, 非结构性碳水化合物(NSC), 高山林线, 光合特性, 养分特征

Abstract: Carbon and nitrogen contents in aggregates are influenced greatly by human disturbance and land use. However, it is uncertain how disturbance and land use affect carbon and nitrogen in aggregates, especially for calcareous soil in karst region in southwest China, where is extremely vulnerable to human disturbance. Based on a longterm field trial in Huanjiang Observation and Research Station, this study identified the distribution characteristics of carbon and nitrogen in calcareous soil aggregates under five kinds of disturbance and land use treatments (enclosure, cutting, burning, pasture, and maize cropland). The results showed that the aggregate composition was dominated by particles >5 mm and 2-5 mm under the different disturbance and land uses. The aggregates of enclosure and cutting lands showed significantly higher values in particles >5 mm than those of the other three landuse patterns, while burning land and maize cropland had high values in <2 mm fraction. In whole soil and all size classes of aggregate particles, enclosure had the highest values of organic carbon and total nitrogen, followed by burning and cutting, while the values of organic carbon and total nitrogen in pasture and maize cropland were relatively lower. The distribution patterns of carbon in different aggregates were variable: enclosure and cutting presented an undulation distribution, and maize cropland showed an inverted “V” shape. The lowest values of organic carbon and total nitrogen appeared in particles 0.054-0.25 mm. The contribution of organic carbon and total nitrogen in >5 mm fraction under enclosure and cutting was significantly higher than that under the other three landuse patterns. Most of the organic carbon and total nitrogen were accumulated in >5 mm and 2-5 mm fractions, which both accounted for 60%-82%. The results suggest that particles of aggregate size >2 mm hold the major parts of the soil carbon and nitrogen in karst calcareous soils. Our findings could provide fundamental information for choosing proper management practices to improve soil fertility as well as carbon and nitrogen sequestration.

Key words: photosynthesis characteristics, non-structural carbohydrate (NSC), alpine treeline, antioxidant system, nutrient characteristics

肖霜霜1,2,3,叶莹莹1,2,3,张伟1,2,吴敏1,2,3,王克林1,2*. 干扰/利用方式对喀斯特石灰土团聚体分布及其碳氮含量的影响[J]. 生态学杂志.

XIAO Shuang-shuang1,2,3, YE Ying-ying1,2,3, ZHANG Wei1,2, WU Min1,2,3, WANG Ke-lin1,2*. Carbon and nitrogen contents in calcareous soil aggregates affected by disturbance and land use in karst region, China.[J]. cje.

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