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将粉碎的苜蓿样装砂滤管埋入不同施肥处理的长期定位试验地，分期取出腐解物样品，并将其进行组分分离，测定燃烧热值，以探讨苜蓿样腐解过程中的能态变化特点及各组分对腐解过程中腐解物总热值的影响，结果表明：苜蓿样腐解过程中腐解物的能态变化可分为波动起伏（第１～７月）、急剧下降（第８，９月）和趋于平稳（第９月以后）３个阶段；纤维素、半纤维素及木质素类物质是影响腐解物热值的主要因素；腐解前期腐解物的能态与土壤肥力呈反相关。
The comminuted alfalfa-packed sand filter tubes were buried in long-term experimental plots of different fertilization treatments. The samples of decomposed materials were removed by stages and fractionated. The calorific value of calorific value was measured to investigate the effect of alfalfa-like decomposing process The results showed that the change of energy state of decomposed matter in alfalfa-like decomposing process can be divided into fluctuant fluctuation (from January to July) (8th, 9th month) and stable (3rd month); cellulose, hemicellulose and lignin are the main factors that affect the calorific value of decomposing compounds; The state of matter is inversely related to soil fertility.