【摘要】 为了揭示沙化农田小麦在不同施肥条件下凋落物的产量特征和变化规律，对科尔沁沙地农田生态系统小麦凋落物产量动态与分解量进行了测定和分析。结果表明，随着施肥量由２２５ｋｇ·ｈｍ－２增加到３００ｋｇ·ｈｍ－２和４５０ｋｇ·ｈｍ－２，沙地小麦凋落物总产量也由３４．３９ｇ·ｍ－２增加到了３９．９７ｇ·ｍ－２和５１．５８ｇ·ｍ－２。处理１中凋落物产量随着小麦的生长由６月１日的１３．１８ｇ·ｍ－２减少到了８．６５ｇ·ｍ－２。处理２和处理３的凋落物的变化趋势则是中间一次（６月１５日）取样测得的产量高于第一次和第三次取样的测定结果。对照则与处理１的变化趋势相反，随着时间而增加。灰分校正对准确地估测小麦的凋落物产量及其数学模型分析有着重要的意义。更多还原

【Abstract】 In order to reveal the dynamics of wheat litter production in Horqin sandy land, analysis has been carried out on the data of litter production and the result of a model prediction of the dynamics of ash free wheat litter material. Analysis showed that the total litter production from each of the three treatments increased with the increase of fertilizer application. Litter production in the contrast was much less than that in any of the three treatments. Temporally, litter production in the contrast increased with the growth of wheat while reversed in treatment 1. The temporal dynamics of litter production in treatment 2 and 3 laid out a middle arched pattern. Ash free correcting was very important for correct estimation of litter production and modeling. Model of M t=M oe -kt could be used to predict the remained decomposed materials and then used to calculate the decomposed part of the litter.更多还原