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中国农学通报

中国农学通报 ›› 2005, Vol. 21 ›› Issue (5): 390-390.

所属专题： 农业生态

• 目次 • 上一篇    下一篇

荒漠生态条件下植物残体分解和养分释放的研究

孙本华,,高明霞,吕家珑,张一平   

  • 出版日期:2005-05-05 发布日期:2005-05-05

The Decomposition of Residue and Nutrient Releasing Under the Condition of Desert Ecosystem

Sun Benhua,, Gao Mingxia, Lü Jialong, Zhang Yiping   

  • Online:2005-05-05 Published:2005-05-05

摘要： 以大豆秆为材料，研究了荒漠生态系统下残体的腐解率和腐解物的有机C、全N、全K含量、养分释放率以及C/N比的变化。结果表明：累积腐解率和有机C的分解率随时间的延长呈上升的趋势。0~1.5个月和1.5~3个月残体腐解率分别为18.9%和18.7%。随腐解时间的推移，残体全N的含量先逐渐上升，6个月后基本不变；全K含量0~1.5个月迅速下降，然后缓慢下降，3个月后基本不变。随腐解时间的延长，K的残留量逐渐减少，10个月后基本不变。N的释放量和释放率均为负值，整个腐解过程并没有N的释放。K的释放集中在0~1.5个月，释放率达75.8%，最终在90%左右。腐解残留物的C/N比先迅速下降，然后缓慢下降，6个月后基本不变，最终为35.9。

Abstract: Quantitative studies on changes of decomposition rate, C/N ratio, N, K and organic C of bean residue during decomposition in desert ecosystem were carried out in Fukang, Xinjiang. Results showed that Accumulative decay rate and organic C decomposition rate of bean residue increased followed by the increasing of decomposition time. The decay rate in 0~1.5 month and 1.5~3 month were 18.9% and 18.7%, respectively. The total N increased gradually first, then kept on after 6 months. The total K decreased quickly at the first 1.5 month, then decreased slowly, then kept on after 3 months. The releasing amount and releasing rate of N were all minus. There was no releasing of N in the whole of decomposition. The releasing rate of K reached 75.8% in 1.5 months, then changed around 90%. The C/N ratio of decay remainders decreased quickly first, then didn’t change on the whole after 6 months, and finally it was 35.9.