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中国沙漠 ›› 1999, Vol. 19 ›› Issue (s1): 103-106.

• 论文 • 上一篇    下一篇

沙化农田小麦凋落物产量测定及分解量预测

赵学勇, 崔建垣, 张铜会   

  1. 中国科学院兰州沙漠研究所, 兰州 730000
  • 出版日期:1999-12-31 发布日期:1999-12-31
  • 基金资助:
    本文得到96-920-13-02、49890330、980121、KE-952-91-218、KE-95 T-04-01-04项目的资助

Estimation and Dynamic Modeling of Wheat Litter Production in Desertified Arable Land in Horqin Sandy Land

ZHAO Xue-yong, CUI Jian-yuan, ZHANG Tong-hui   

  1. Institute of Desert Research, Chinese Academy of Sciences, Lanzhou 730000, China
  • Online:1999-12-31 Published:1999-12-31

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。

关键词: 凋落物, 有机质, 灰分校正, 模型

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 Mt=Moe-kt could be used to predict the remained decomposed materials and then used to calculate the decomposed part of the litter.

Key words: Litter, Organic matter, Ash correcting, Model

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