中国西南喀斯特潮湿气候下干旱胁迫人工牧草地土壤水生态系统服务研究
发布时间：2019-06-08 18:58
【摘要】：文中质疑草地的"覆盖减少蒸散说",验证冷季型人工牧草地在西南喀斯特冬春旱季是否能发挥有益的土壤水调节功能。将盆栽草和原生土壤视为最小的可测量生态系统单元,通过差减法连续观察草类对土壤系统水分散失的影响。结果表明:冷季型人工草并不能保证生态系统具有比无覆盖土壤更好的水分保持能力,相反加速了土壤水散失。仅常态下10天内高密度高羊茅草地消耗1.11×10~4t/km~2和黑麦草地6.3×10~3t/km~2水,就远大于裸地消耗5.2×10~3t/km~2。"覆盖减少蒸散说"在西南喀斯特冬春少雨季节并不成立,反之短时裸土生态系统具有良好水调节能力,其季节性生态服务价值也较多年生草地生态系统更大。
[Abstract]:This paper questions the theory of "covering and reducing evaporation" of grassland, and verifies whether the cold season artificial forage land can play a beneficial role in soil water regulation in southwest Karst winter and spring dry season. Pot planting grass and native soil were regarded as the smallest measured ecosystem units, and the effects of grass on soil water loss were observed continuously by difference subtraction method. The results showed that cold season artificial grass could not guarantee that the ecosystem had better water retention ability than that of uncovered soil, on the contrary, it accelerated the loss of soil water. Under normal conditions, 1.11 脳 10~4t/km~2 and 6.3 脳 10~3t/km~2 water was consumed in high density and high density herbage land within 10 days, which was much higher than that in bare land. " The theory of cover reducing evaporation is not established in southwest Karst winter and spring rain season, on the contrary, the short-term bare soil ecosystem has good water regulation ability, and its seasonal ecological service value is greater than that of perennial grassland ecosystem.
【作者单位】： 贵州师范大学中国南方喀斯特研究院;
【基金】：国家十三五重点研发课题(2016YFC0502607) 国家自然科学基金项目(41561047) 国家青年基金项目(41301504)资助
【分类号】：S812.2
本文编号：2495500
[Abstract]:This paper questions the theory of "covering and reducing evaporation" of grassland, and verifies whether the cold season artificial forage land can play a beneficial role in soil water regulation in southwest Karst winter and spring dry season. Pot planting grass and native soil were regarded as the smallest measured ecosystem units, and the effects of grass on soil water loss were observed continuously by difference subtraction method. The results showed that cold season artificial grass could not guarantee that the ecosystem had better water retention ability than that of uncovered soil, on the contrary, it accelerated the loss of soil water. Under normal conditions, 1.11 脳 10~4t/km~2 and 6.3 脳 10~3t/km~2 water was consumed in high density and high density herbage land within 10 days, which was much higher than that in bare land. " The theory of cover reducing evaporation is not established in southwest Karst winter and spring rain season, on the contrary, the short-term bare soil ecosystem has good water regulation ability, and its seasonal ecological service value is greater than that of perennial grassland ecosystem.
【作者单位】： 贵州师范大学中国南方喀斯特研究院;
【基金】：国家十三五重点研发课题(2016YFC0502607) 国家自然科学基金项目(41561047) 国家青年基金项目(41301504)资助
【分类号】：S812.2
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