文献类型：期刊文献

中文题名：喀斯特断陷盆地典型林地土壤酶活性及理化性质研究

英文题名：Soil enzyme activities and physicochemical properties of typical woodlands in karst faulted basins

作者：孙永磊[1,2] 卢泽洋[3] 周金星[1,2] 庞丹波[1,2] 刘玉国[4] 关颖慧[1,2]

第一作者：孙永磊

机构：[1]北京林业大学水土保持学院,云南建水荒漠生态系统国家定位观测研究站,北京100083;[2]北京林业大学水土保持国家林业和草原局重点实验室,北京100083;[3]国家林业和草原局调查规划设计院,北京100714;[4]中国林业科学研究院荒漠化研究所,北京100091

年份：2020

卷号：0

期号：2

起止页码：40-48

中文期刊名：北京林业大学学报

外文期刊名：Journal of Beijing Forestry University

收录：CSTPCD;;北大核心:【北大核心2017】；CSCD:【CSCD2019_2020】；

基金：国家重点研发计划(2016YFC0502504、2016YFC0502500);国家自然科学基金项目(31500583);中央级公益性科研院所基本科研业务费专项(CAFYBB2014ZD006、CAFYBB2016QB020).

语种：中文

中文关键词：断陷盆地;典型林地;土壤酶活性;土壤理化性质;冗余分析

外文关键词：faulted basin;typical woodland;soil enzyme activity;soil physicochemical property;redundancy analysis

分类号：S714.7

摘要：【目的】土壤酶参与土壤中各种生物化学过程,与土壤理化性质密切相关。本文以喀斯特断陷盆地3种典型林地为研究对象,探究林地土壤酶活性与理化性质之间的关系,为该地区植被生态恢复工作提供参考依据。【方法】本研究以喀斯特断陷盆地云南松林、桉树林和天然次生林为研究对象,采用冗余分析方法,探讨不同林地土壤酶活性及其与理化性质之间的关系。【结果】(1)3种林地土壤pH介于5.47~6.03之间,10~20 cm和20~30 cm土层土壤密度,云南松林显著高于桉树林和次生林(P <0.05),0~10 cm和10~20 cm土层全氮含量,桉树林显著高于云南松林和次生林(P <0.05),0~10 cm土层速效磷含量,次生林显著高于云南松林和桉树林(P <0.05),有机碳和铵态氮含量整体呈现次生林>云南松林>桉树林的规律。(2)3种林地0~10 cm土层酸性磷酸酶和脲酶活性为次生林>桉树林>云南松林,而10~20 cm土层呈现相反的规律。淀粉酶、纤维素酶和蔗糖酶活性在0~10 cm和10~20 cm土层均为次生林最高,云南松林次之,桉树林最低。此外,林地各土层间土壤酶活性具有显著性差异(P <0.05),土壤酶活性呈现出随土层深度增加而逐渐降低的趋势。(3)冗余分析表明,有机碳、铵态氮、速效磷和pH均与蔗糖酶活性呈显著正相关关系,而全氮与蔗糖酶活性呈显著负相关关系。土壤密度与脲酶和酸性磷酸酶活性呈负相关关系。(4)蒙特卡洛检验表明土壤理化性质对土壤酶活性影响的重要性大小排序为:有机碳(41.4%)>铵态氮(32.9%)>速效磷(24.3%)>土壤密度(12.6%)>全氮(7.9%)>pH(5.5%)。【结论】综上分析表明,有机碳、铵态氮等是影响研究区内土壤酶活性变化的主要指标,在断陷盆地林地土壤肥力和酶活性恢复方面,次生林最佳,而云南松林的优势高于桉树林。
[Objective] Soil enzymes are involved in all soil biochemical processes and are closely related to soil physicochemical properties. In this paper, three typical woodlands in karst faulted basins were studied,and the relationships between soil enzyme activities and physicochemical properties of forest lands were explored, which provided a reference for vegetation ecological restoration in this area. [Method] In this study, the Pinus yunnanensis, Eucalyptus maideni and natural secondary forest in the karst faulted basin were used as research objects. The relationship between soil enzyme activities and physicochemical properties was studied using the methods of redundancy analysis. [Result](1) The soil pH values of the three forest lands ranged from 5.47 to 6.03, and the soil bulk densities of the 10-20 cm and 20-30 cm soil layers in the Pinus yunnanensis forest were significantly higher than those of the Eucalyptus maideni forest and the secondary forest(P < 0.05). The contents of total nitrogen(TN) in 0-10 cm and 10-20 cm layers of Eucalyptus maideni forest were significantly higher than those in Pinus yunnanensis forest and secondary forest(P < 0.05). The available phosphorus(AP) content in 0-10 cm soil layer of secondary forest was significantly higher than that in Pinus yunnanensis forest and Eucalyptus maideni forest(P < 0.05). The contents of soil orgenic carbon(SOC) and ammonium nitrogen(AN) showed the law of secondary forest >Pinus yunnanensis forest > Eucalyptus maideni forest.(2) The activity of acid phosphatase and urease in the 0-10 cm soil layer of three woodlands was in the order of secondary forest > Eucalyptus maideni forest >Pinus yunnanensis forest, while the 10-20 cm soil layer showed the opposite law. The highest activities of amylase, cellulase and invertase in 0-10 cm and 10-20 cm soil layers were obtained from secondary forest,followed by Pinus yunnanensis forest and the lowest in Eucalyptus maideni forest. In addition, the soil enzyme activities in the soil layers of the forests were significantly different(P < 0.05), and the soil enzyme activities showed a trend of decreasing with the increase of soil depth.(3) Through the redundancy analysis of soil physicochemical properties and enzyme activities in the three forest lands, the results showed that SOC, AN, AP and pH all had a significant positive correlation with invertase activity. However, TN was significantly negatively correlated with invertase activity. Soil bulk density was negatively correlated with urease and acid phosphatase activities.(4) the Monte Carlo test showed that the order of importance of soil physicochemical properties on soil enzyme activities was: SOC(41.4%) > AN(32.9%) > AP(24.3%) > soil bulk density(12.6%) > TN(7.9%) > pH(5.5%). [Conclusion] Comprehensive analysis showed that SOC and AN were the main indicators affecting the changes of soil enzyme activity in the study area. The secondary forest is the best in the restoration of soil fertility and enzyme activity in karst faulted basins,while the advantage of Pinus yunnanensis forest is higher than that of Eucalyptus maideni forest.