AN Shao-shan,HUANG Yi-mei,LIU Meng-yun,et al.The Responses of Soil Fertility Quality to Ecological Rehabilitation in Ningxia Loess Hilly-gully Region[J].Research of Soil and Water Conservation,2005,12(03):22-26.
宁南宽谷丘陵区土壤肥力质量对生态恢复的响应
- Title:
- The Responses of Soil Fertility Quality to Ecological Rehabilitation in Ningxia Loess Hilly-gully Region
- Keywords:
- soil fertility quality; ecological rehabilitation; Ningxia loess hilly-gully area; responses; CA
- 分类号:
- S158
- 摘要:
- 宁南宽谷丘陵区固原试区经过20多年的综合治理与生态恢复重建，土地利用结构和林草覆盖率发生了很大的变化。针对不同生态恢复措施对土壤肥力质量的影响进行了研究，结果表明天然草地和灌木林地有机质、速效氮和速效钾等养分含量明显高于农地和果园，土壤pH和容重降低，土体中>5mm水稳性团聚体和>0.01mm微团粒的数量显著地增加，土壤的营养状况得到很大改善，结构变好，协调供应养分和水分的能力提高，能促进黏粒形成聚积，提高土壤酶活性，有效地减少水土流失，防止土地退化和保护生态环境。土壤综合质量指数表现为灌木林≈天然草地>人工草地>农地≈果园。
- Abstract:
- Soil quality restoration and soil management is the key factor for vegetation construction and eco-environment sustainable development in Loess Plateau. The evolvement rule of soil chemical, physical, biological indicators and soil comprehensive quality index were clarified with different vegetation recovering ways. Soil organic matter, total nitrogen, available nitrogen, CEC are shown as bush forest land>natural meadow>artificial meadow>orchard>farmland, but the available P and available K are differently influenced by fertilizing. The density of soil was shown as:orchard>farmland>natural meadow>artificial meadow>bush forest land in the surface layer. Soil total aggregate was shown as:natural meadow>bush forest land >orchard>farmland>artificial meadow. To different lands usage types, bush forest land and natural meadow had promote function to the development of larger particle diameter aggregate, but farmland, orchard and artificial meadow had the function to the smaller ones. Soil microaggregate was shown as higher content of 1～0.01 mm tiny aggregate in bush forest land, artificial meadow and natural meadow, but orchard was lower comparatively. There were distinct differences in soil biology enzyme activities. Natural meadow had the highest enzyme activity, than bush forest land and artificial meadow, orchard and farmland were lower. For bush forest land, it was higher enzyme activity in longer planted year than shorter, but orchard has no remarkable differences. The SQR (soil quality index) showed the bush forest land≈natural meadow>artificial meadow>farmland≈orchard.
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备注/Memo
收稿日期:2004-12-20;改回日期:。
基金项目:国家十五科技攻关课题（2001BA606A-04）；国家自然科学基金（40461006）；西北农林科技大学优秀人才项目（04ZX011）
作者简介:安韶山（1972- ），男，宁夏平罗人，博士，助研，主要从事土壤学与流域生态与管理研究工作。