宁夏黄土丘陵区植被恢复对土壤养分和微生物生物量的影响  

Soil nutrient and microbial biomass in the Loess hilly area of Ningxia under different plant rehabilitation patterns

作　　者：成毅[1] 安韶山[1,2,3] 李国辉[1] 李第红[1] 

机构地区：[1]西北农林科技大学资源环境学院,杨凌712100 [2]西北农林科技大学黄土高原土壤侵蚀与旱地农业国家重点实验室,杨凌712100 [3]中国科学院水利部水土保持研究所,杨凌712100

出　　处：《中国生态农业学报》2010年第2期261-266,共6页Chinese Journal of Eco-Agriculture

基　　金：国家自然科学基金项目(40971171;40701095);"十一五"国家科技支撑计划重大项目(2006BCA01A07);西北农林科技大学"青年学术骨干支持计划"资助

摘　　要：本研究以宁夏固原天然草地、农地、撂荒地和不同年限的柠条林地为研究对象, 分析了不同植被类型下土壤养分和土壤微生物生物量碳、氮、磷的变化。研究结果表明： 土壤养分除速效磷和全氮外, 其他指标均为农地最低, 撂荒地次之, 并且随植被恢复年限的增加而增加; 不同植被类型条件下, 土壤微生物生物量有显著差异, 微生物量碳含量表现为撂荒地〈农地〈天然草地〈3年柠条林地〈13年柠条林地〈23年柠条林地, 微生物量氮以天然草地最低, 农地、撂荒地和不同年限柠条林地较大, 不同植被类型土壤微生物量磷差异显著, 在5～20 cm土层和20～40 cm土壤中表现尤为突出。土壤微生物量碳、氮、磷与植被类型和植被恢复年限关系密切。柠条林对土壤微生物生物量有明显促进作用, 并且随着植被恢复年限的增加改良效果越显著。Nutrient and microbial biomass carbon （Cmic）, nitrogen （Nmic）, phosphorus （Pmic） in soils of Guyuan Loess hills of Ningxia Province under natural grassland, cropland, abandoned cropland and varying ages of rehabilitated Caragana korshinskii shrub lands were determined. Base on the results, soil nutrients contents increase with increasing age of rehabilitation, and are generally low in cropland and newly abandoned cropland, with the exception of available P and total nitrogen. Soil microbial biomass is significantly different under different vegetations. Cmic occurs in the order of abandoned cropland 〈 cropland 〈 natural grassland 〈 3-year-old C. korshinskii shrub land 〈 13-year-old C. korshinskii shrub land 〈 23-year-old C. korshinskii shrub land. While natural grassland has the lowest Nmic, cropland, abandoned cropland and the different-aged C. korshinskii shrub lands have higher Nmic. Pmic is sig-nificantly different under different vegetations, especially in the soil depths of 5～20 cm and 20～40 cm. Soil Cmic, Nmic and Pmic are significantly related with vegetation type and rehabilitation age. C. korshinskii shrub shows obvious enhancing ability on soil microbial biomass, which is improved by increased rehabilitation age.

关 键 词：土壤养分 土壤微生物生物量碳 氮 磷 植被恢复 天然草地 农地 撂荒地 柠条林地 

分 类 号：S151.9[农业科学—土壤学]