栗钙土施肥土壤有机碳特性与平衡调控研究

有机无机肥配施明显改善了栗钙土土壤有机 C特性 ,土壤总有机 C、易氧化 C、重组 C、有机 C复合量增大 ,提高了土壤有机 C活性 ,松、稳和紧结态 C含量增加 ,且以紧、松结态 C为主 ,同砂质栗钙土相比 ,壤质草甸栗钙土呈现紧结态 C向稳结态 C转化趋势。不同有机物料在砂质栗钙土和壤质草甸栗钙土上腐殖化系数分别变化于 0 .2 5～ 0 .68和 0 .4 1～ 0 .72之间 ,矿化率则分别变化于 2 .86%～ 4 .53%和 1 .1 0 %～ 3.77%之间。维持高水平土壤有机 C平衡的有机物料临界施用量砂质栗钙土需秸秆类肥 1 1 2 56.5kg· hm-2或畜粪肥1 0 953.4 kg·hm-2或农家肥 32 1 76.5kg· hm-2 ,而壤质草甸栗钙土则需秸秆类肥 7379.2 kg· hm-2或畜粪肥681 4 .0 kg·hm-2或农家肥 1 4 1 58.1 kg· hm-2。

Study on Soil Organic Carbon Properties and Balance Regulation with Fertilizer Application in Chestnut Soil

Complexed application of organic and inorganic fertilizer could evidently improve the properties of soil organic carbon in chestnut soil and it could increase the contents of total organic carbon, active organic carbon, heavy fraction carbon and organic carbon complex quantity. Moreover,it promoted the activity of soil organic carbon and increased the contents of loose combined C, stable combined C and tight combined C, in which loose combined C and tight combined C should be given priority to. In contrast with sandy chestnut soil,loamy meadow chestnut soil appeared the trend that tight combined C transformed into stable cornbined C.The ranges of humification coefficient of different organic manures in sandy chestnut soil and loamy meadow chestnut soil were 0.25～0.68 and 0.41～0.72, respectively, while the scope of mineralization rate separately were 2.86～4.53 percent and 1.10～3.77 percent.The critical applying quantity of organic manures that could keep the balance of high level organic carbon were 11 256.5 kg.hm-2 straw manure or 10 953.4 kg.hm-2 stock manure or 32 176.5 kg.hm-2 farmyard manure in sandy chestnut soil,while needed 7 379.2 kg.hm-2 straw manure or 6 814.0 kg.hm-2 stock manure or 14 158.1 kg.hm-2 farmyard manure in loamy meadow chestnut soil.