本文選題：荒漠草原 + 地統(tǒng)計(jì)學(xué)��； 參考：《水土保持學(xué)報(bào)》2016年04期

【摘要】：采用地統(tǒng)計(jì)學(xué)方法,以荒漠草原自由放牧草地3種典型"覆沙—侵蝕"微地形地貌為對(duì)象,研究不同微地形地貌區(qū)域草地植物多樣性分布格局對(duì)土壤養(yǎng)分、地表枯落物和羊糞量、地表微高程等環(huán)境因子的響應(yīng)。結(jié)果表明:微地形坡面面積比例70%,地表微高程變化屬中等變異強(qiáng)度(CV1),表層土壤粗沙粒含量為80%,植被蓋度為20%時(shí),地表枯落物、土壤全磷和全氮、地表微高程深刻影響著植物多樣性空間異質(zhì)性分布格局。微地形坡面面積比例為50%,地表微高程變化屬強(qiáng)度變異(CV1),表層土壤粗沙粒含量為70%,植被蓋度40%時(shí),土壤全磷、地表微高程顯著影響植物多樣性分布格局特征�；哪菰L(fēng)蝕作用形成的"覆沙—侵蝕"微地形地貌引起各非生物要素在空間上的重新分配作用,顯著影響植物群落多樣性的空間異質(zhì)性特征。不同微地形地貌特征約束條件下,植物多樣性分布格局是各非生物要素共同作用的結(jié)果,但對(duì)不同環(huán)境要素的響應(yīng)程度存在較大差異,這種差異性很可能與放牧干擾強(qiáng)度存在密切相關(guān)性。
[Abstract]:By using geostatistics method, three typical "sand cover and erosion" microtopography and landform of desert steppe free grazing grassland were used to study the distribution pattern of grassland plant diversity on soil nutrients in different microtopography and geomorphology areas. Response of environmental factors such as litter and sheep feces, surface microelevation and so on. The results showed that the ratio of surface area to slope area was 70%, the variation of surface elevation was of moderate variation intensity, the content of coarse sand in surface soil was 80, the vegetation coverage was 20, the litter, total phosphorus and total nitrogen of soil were observed. The spatial heterogeneity distribution pattern of plant diversity is deeply influenced by surface microelevation. The slope area ratio of microtopography is 50, the variation of surface elevation belongs to intensity variation (CV1), the content of coarse sand in surface soil is 70. When vegetation coverage is 40, total phosphorus in soil and surface microelevation significantly affect the distribution pattern of plant diversity. Wind erosion of desert steppe resulted in the spatial redistribution of various abiotic elements due to the formation of "covered sand and erosion" microtopography, which significantly affected the spatial heterogeneity of plant community diversity. Under the constraints of different microtopography and geomorphology characteristics, the distribution pattern of plant diversity is the result of the interaction of various abiotic elements, but the degree of response to different environmental elements is quite different. This difference is likely to be closely related to grazing disturbance intensity.
【作者單位】： 寧夏大學(xué)農(nóng)學(xué)院;寧夏大學(xué)西北土地退化與生態(tài)恢復(fù)國家重點(diǎn)實(shí)驗(yàn)室培育基地/西北退化生態(tài)系統(tǒng)恢復(fù)與重建教育部重點(diǎn)實(shí)驗(yàn)室;
【基金】：國家自然科學(xué)基金項(xiàng)目(41461046) 國家重點(diǎn)基礎(chǔ)研究發(fā)展計(jì)劃前期專項(xiàng)(2012CB723206)
【分類號(hào)】：S812
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本文編號(hào)：1891701