發(fā)布時間：2018-06-25 09:24

  本文選題：隴中黃土高原 + 耕作措施��； 參考：《土壤學(xué)報》2017年03期

【摘要】：依托隴中黃土高原旱作農(nóng)田已實施13 a的保護(hù)性耕作試驗,研究傳統(tǒng)耕作、免耕、傳統(tǒng)耕作秸稈還田、免耕秸稈覆蓋、傳統(tǒng)耕作地膜覆蓋和免耕地膜覆蓋6種耕作措施下土壤全磷及磷組分動態(tài)變化特征。結(jié)果表明:試驗期各處理土壤全磷和總無機(jī)磷均逐年增長;兩個秸稈還田處理總有機(jī)磷逐年增長,免耕地膜覆蓋和免耕處理總體增長,傳統(tǒng)耕作和傳統(tǒng)耕作地膜覆蓋處理相對穩(wěn)定;各無機(jī)磷組分均總體增長,其中氫氧化鈉提取態(tài)無機(jī)磷、水溶態(tài)無機(jī)磷和碳酸氫鈉提取態(tài)無機(jī)磷漲幅較大,平均漲幅分別為253.6%、128.6%和66.9%;保護(hù)性耕作可不同程度地提高水溶態(tài)無機(jī)磷、碳酸氫鈉提取態(tài)無機(jī)磷和氫氧化鈉提取態(tài)無機(jī)磷含量,相同覆蓋條件下免耕較傳統(tǒng)耕作效果明顯,尤其免耕秸稈覆蓋處理最明顯;耕作方式對濃鹽酸提取態(tài)無機(jī)磷和殘留磷的影響不明顯;保護(hù)性耕作可提高碳酸氫鈉提取態(tài)有機(jī)磷和氫氧化鈉提取態(tài)有機(jī)磷含量,兩個秸稈還田處理最明顯,兩處理也可提高濃鹽酸提取態(tài)有機(jī)磷含量,但免耕、傳統(tǒng)耕作地膜覆蓋和免耕地膜覆蓋處理下該組分含量降低。綜上,采取保護(hù)性耕作可適當(dāng)減少磷肥用量,保護(hù)性耕作尤其是免耕秸稈覆蓋方式值得在該區(qū)推廣。
[Abstract]:Conservation tillage experiments have been carried out for 13 years on dryland farmland in the Loess Plateau of central Gansu Province. Traditional tillage, no-tillage, straw returning and straw mulching have been studied. Dynamic changes of total phosphorus and phosphorus components in soils under six tillage practices: traditional tillage film mulching and no-tillage film mulching. The results showed that the total phosphorus and total inorganic phosphorus of each treatment increased year by year, the total organic phosphorus of two straw returning treatments increased year by year, the total organic phosphorus of no-tillage film mulching and no-tillage treatment increased. Traditional tillage and plastic film mulching treatments were relatively stable, and all inorganic phosphorus components increased, among which sodium hydroxide extracted inorganic phosphorus, water-soluble inorganic phosphorus and sodium bicarbonate inorganic phosphorus increased significantly. The average increases were 253.6% and 66.9%, respectively. Conservation tillage could increase the contents of inorganic phosphorus in aqueous solution, inorganic phosphorus extracted by sodium bicarbonate and inorganic phosphorus extracted from sodium hydroxide. The effect of no-tillage under the same mulching condition was better than that of traditional tillage. The effects of tillage on inorganic phosphorus and residual phosphorus in concentrated hydrochloric acid were not obvious, and conservation tillage could increase the contents of organic phosphorus extracted by sodium bicarbonate and organic phosphorus extracted by sodium hydroxide. The two treatments could also increase the content of organic phosphorus extracted by HCl, but the content of organic phosphorus was decreased under the treatment of no-tillage, traditional tillage film mulching and no-tillage film mulching. Conservation tillage, especially no-tillage straw mulching, is worth popularizing in this area.
【作者單位】： 甘肅農(nóng)業(yè)大學(xué)資源與環(huán)境學(xué)院;
【基金】：國家自然科學(xué)基金項目(31160269,31571594) 國家科技支撐計劃項目(2012BAD14B03)資助~~
【分類號】：S153.6

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本文編號：2065447