基于灰渣和猪粪制造的有机无机复混肥对土壤易变性有机碳的影响

Soil Labile Organic Carbon as Influenced by Organic-inorganic Compound Fertilizer Made from Ash and Pig Manure

通过田间试验研究了不施肥（CK）、化肥（NPK）、基于灰渣和猪粪制造的有机无机复混肥高、中、低水平（CFI、CF2和CF3）5种施肥处理下0～60cm土壤易变性有机碳含量及其在玉米生长期内的动态变化。结果表明：CF1、CF2和CF3处理能显著提高0～60cm土壤总有机碳（TOC）和易变性有机碳的含量及易变性有机碳的活性（P〈0．05），其中以CF2处理提高最显著；施肥对土壤易变性有机碳影响随着土层的加深而减弱。土壤易氧化有机碳（ROC）、溶解性有机碳（DOC）、水溶性有机碳（WSOC）这3种易变性有机碳中ROC和DOC可以作为指示土壤有机碳对有机无机复混肥敏感的指标，可用于预测土壤有机碳的变化趋势。研究基于灰渣和猪粪制造的有机无机复混肥对土壤有机碳库含量的影响，还需进行长期的定位试验。

A field experiment was conducted to study the dynamics of soil labile organic carbon in 0-60 cm soil layer at the growth stage of maize. Five treatments, including no fertilizer（CK）, chemical fertilizer only （NPK） and three application rates of organic-inorganic com- pound fertilizers made from ash and pig manure（high-CF1, medium-CF2 and low-CF3 ） were used. Compared to the control, applying or- ganic-inorganic compound fertilizer significantly increased the contents of total organic carbon（TOC ） and labile organic carbon in 0-60 cm soil layer（P〈0.05 ）, with the most significant effects found in CF2 treatment. The effects of fertilizers on soil labile organic carbons decreased gradually with soil depth. Significant correlations were observed among TOC, easily oxidizable organic carbon（ ROC ）, dissolved organic car- bon （DOC） and water-soluble organic carbon （WSOC）. ROC and DOC were more sensitive to organic-inorganic compound fertilizers than other organic carbons, which could forecast dynamic of TOC. However, more research is needed to better understand the long term impacts of such organic-inorganic compound fertilizers on soil organic carbon pools.