本文關(guān)鍵詞： 錫林郭勒草原 放牧條件 凍融 水熱狀況　出處：《水土保持研究》2017年05期 　論文類型：期刊論文

【摘要】：內(nèi)蒙古草原地處季節(jié)性凍土區(qū),與放牧強(qiáng)度相關(guān),土壤凍融過程對該地生態(tài)和水文過程有著顯著影響,但相關(guān)研究相對欠缺。該文重點(diǎn)研究了內(nèi)蒙古錫林郭勒草原3種放牧條件下UG79(1979年以來禁牧)、UG99(1999年以來禁牧)、HG(1979年以來持續(xù)放牧)季節(jié)性凍融期的土壤水熱動態(tài),以期準(zhǔn)確理解放牧這一當(dāng)?shù)刂饕恋乩媚Ｊ綄ν寥郎鷳B(tài)水文過程的影響。結(jié)果表明:與地上覆蓋度相關(guān),不同放牧條件下地表積雪厚度有明顯差異,其中HG處理積雪厚度遠(yuǎn)小于其他處理,其土壤溫度變化也最為劇烈。與不同處理土壤凍結(jié)速率相關(guān),土壤凍結(jié)時(shí)HG,UG79和UG99的"聚墑區(qū)"分別為20—30cm,10—20cm和10—30cm,其中UG99"聚墑區(qū)"分布范圍最廣,且集中在牧草根系發(fā)達(dá)區(qū)域,對來年牧草生長提供了更好的水分條件。換言之,由于凍后聚墑效應(yīng),土壤消融期水分含量在土壤表層高于凍融前,其中UG99處理最大,達(dá)到了0.19m~3/m~3。該研究結(jié)果為內(nèi)蒙古草原季節(jié)性凍土區(qū)控制放牧及合理的禁牧措施提供理論依據(jù)。
[Abstract]:The grassland of Inner Mongolia is located in the seasonal frozen soil area, which is related to the grazing intensity. The freezing and thawing process of the soil has a significant influence on the ecological and hydrological process. But the relative research is relatively lacking. This paper focuses on the study of UG79under three kinds of grazing conditions in Xilingol grassland of Inner Mongolia (forbidding grazing since 1979 and prohibiting grazing since 1999). Soil water and heat dynamics during seasonal freeze-thaw period of HG (continuous grazing since 1979). In order to understand the influence of grazing, the main land use model, on the soil eco-hydrological process, the results showed that there were significant differences in the thickness of snow cover under different grazing conditions. The thickness of snow in HG treatment was much smaller than that in other treatments, and the change of soil temperature was the most intense, which was related to the freezing rate of different treatments and HG during soil freezing. The "soil moisture accumulation area" of UG79 and UG99 were 20-30 cm ~ 10 ~ (-20) cm and 10 ~ (-30) cm, respectively, and the "soil moisture accumulation area" of UG99 was the most widely distributed. And concentrated in the developed area of forage roots, the forage growth in the next year to provide better water conditions. In other words, due to the effect of soil moisture accumulation after freezing, soil moisture content in the soil surface layer is higher than that before freezing and thawing. Among them, UG99 treatment was the largest, reaching 0.19 mg / m ~ (-3). The results provided a theoretical basis for grazing control and reasonable forbidding measures in the seasonal frozen soil region of Inner Mongolia steppe.
【作者單位】： 西北農(nóng)林科技大學(xué)資源環(huán)境學(xué)院;Department
【基金】：國家自然科學(xué)基金項(xiàng)目(4137124,41371233,41501231)
【分類號】：S812.2
【正文快照】： 凍土是指溫度低于0℃且含有冰的土壤[1],其對外界溫度的變化十分敏感[2],伴隨著溫度變化土壤凍融交替現(xiàn)象頻繁發(fā)生[3]。土壤凍融過程可以改變土壤的水力特性和微生物活性[4-8],影響地表、植被和大氣之間的熱量交換,甚至于區(qū)域氣候特征。反之,氣候變化也能引起土壤凍融過程的變，

本文編號：1453162