【摘要】：文中質(zhì)疑草地的"覆蓋減少蒸散說(shuō)",驗(yàn)證冷季型人工牧草地在西南喀斯特冬春旱季是否能發(fā)揮有益的土壤水調(diào)節(jié)功能。將盆栽草和原生土壤視為最小的可測(cè)量生態(tài)系統(tǒng)單元,通過(guò)差減法連續(xù)觀察草類對(duì)土壤系統(tǒng)水分散失的影響。結(jié)果表明:冷季型人工草并不能保證生態(tài)系統(tǒng)具有比無(wú)覆蓋土壤更好的水分保持能力,相反加速了土壤水散失。僅常態(tài)下10天內(nèi)高密度高羊茅草地消耗1.11×10~4t/km~2和黑麥草地6.3×10~3t/km~2水,就遠(yuǎn)大于裸地消耗5.2×10~3t/km~2。"覆蓋減少蒸散說(shuō)"在西南喀斯特冬春少雨季節(jié)并不成立,反之短時(shí)裸土生態(tài)系統(tǒng)具有良好水調(diào)節(jié)能力,其季節(jié)性生態(tài)服務(wù)價(jià)值也較多年生草地生態(tài)系統(tǒng)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.
【作者單位】： 貴州師范大學(xué)中國(guó)南方喀斯特研究院;
【基金】：國(guó)家十三五重點(diǎn)研發(fā)課題(2016YFC0502607) 國(guó)家自然科學(xué)基金項(xiàng)目(41561047) 國(guó)家青年基金項(xiàng)目(41301504)資助
【分類號(hào)】：S812.2

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