CHEN Jing,CHEN Hai,ZHU Dayun,et al.Effects of Combined Governance Using Forest and Grass on Stability and Erosibility of Soil Aggregates in Rock Desertification Area[J].Research of Soil and Water Conservation,2020,27(04):1-7.
石漠化地区林草复合治理对土壤团聚体稳定性和可蚀性的影响
- Title:
- Effects of Combined Governance Using Forest and Grass on Stability and Erosibility of Soil Aggregates in Rock Desertification Area
- 文章编号:
- 1005-3409(2020)04-0001-07
- Keywords:
- soil aggregates; stability; erodibility; forest and grass allocation model; rock desertification governance
- 分类号:
- S152.4
- 文献标志码:
- A
- 摘要:
- 石漠化治理区林草复合系统下土壤结构状况是衡量石漠化生态治理成效的重要指标。为探讨石漠化治理中不同林草配置方式对土壤团聚体的影响,以复合林草地为研究对象,天然灌草地为对照,采用大团聚体含量、结构破坏率、团聚体直径指标(MWD,GMD)、分形维数(D)和K值对土壤团聚体的稳定性及可蚀性进行了分析。结果表明:与天然灌草相比,人工林草能有效地增加土壤机械稳定性、水稳性大团聚体含量,降低土壤结构破坏率。人工林草地与草地土壤团聚体MWD,GMD较高,D值较低; 4种典型林草配置模式下的土壤团聚体稳定性指数表现为ASI林草地>ASI人工灌草>ASI林灌草地>ASI人工草地,显然林草地团聚体结构更为稳定。林草复合模式下土壤可蚀性K值较低,但影响尚未达到显著水平。此外,团聚体含量分别与土壤团聚体直径指标(WMD,GMD)和分形维数(D)呈线性相关关系; 1,2,5 mm粒级是土壤团聚化过程中的重要临界点。研究表明,人工林草地有利于增强土壤结构稳定性和减少水土流失,宜于在该区域进一步实施和推广。
- Abstract:
- Soil structure under forest-grass complex model in rocky desertification control area is an important index to measure the effect of ecological control of rocky desertification. To explore the effect of different forest and grass allocation methods on soil quality in rocky desertification governance, taking tree-grass complex model as research example, with natural shrub-grass land as control, soil aggregate stability under different forest and grassland allocations in rocky desertification areas was analyzed by using the parameters such as the rate of macro-aggregates, the percentage of aggregate destruction, the mean weight diameter(WMD), the geometric mean diameter(GMD)and the fractal dimension(D). The results show that planted forest and grass can increase the rate of macro-aggregates with mechanical stability and water stability and reduce the percentage of aggregate destruction effectively compared with natural shrub-grass land; MWD and GMD are higher, and the D value is lower in the forest-grassland and artificial grassland; the stability indices of soil aggregates in four typical forest and grassland allocation patterns decrease in the order: ASI forest grassland>ASI artificials hrub>ASI forest shrub>ASI artificial grassland, it is obvious that the soil aggregate structure in forest grassland is more stable. The results of erodibility analysis indicate that the soil erodibility K value is lower in the forest-grass compound model, and the influence of different forest grass configuration patterns on the K value has not reached a significant level. Correlation analysis finds that the aggregate content is linearly related to the soil aggregate diameter indices(WMD, GMD)and fractal dimension(D), but the correlation levels are quite different; the aggregates of 1, 2, 5 mm grain size are the critical points in the transformation process of shifting soil microaggregates to macroaggregates. The results show that the planted grassland is beneficial to enhance the stability of soil structure and reduce soil erosion, and is suitable for further implementation and promotion in this region.
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备注/Memo
收稿日期:2019-06-09 修回日期:2019-09-24
资助项目:国家“十三五”重点研发计划项目(2016YFC0502601); 国家自然科学基金(41907042); 贵州教育厅青年科技人才成长项目(黔教合KY字[2018]127); 贵州省科技支撑计划(黔科合支撑[2018]2777)
第一作者:陈静(1996—),女,贵州毕节人,硕士研究生,研究方向为喀斯特地貌与洞穴。E-mail:wmclwzs2@126.com
通信作者:陈浒(1965—),男,贵州遵义人,教授,硕士研究生导师,主要从事喀斯特生态与环境研究。E-mail:gy_chenhu@163.com