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effect of soil drying
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     Effect of Soil Drying on the Amino Acids in Leaves of Wheat at Different Development Periods
     土壤干旱对不同生育期小麦叶片及种子氨基酸的影响
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     EFFECT OF SOIL DRYING ON CH_4 FLUX FROM RICE PADDY SOIL
     烤田对种稻土壤甲烷排放的影响
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     Summary A pot experiment in greenhouse was carried out to study the effect of soil drying on CH_4 flux from rice paddy soil.
     本文通过温室盆栽试验研究了烤田对种稻土壤甲烷排放的影响。
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  effect of soil drying
The effect of soil drying and rewetting on the contribution of various nutrient release or transformation processes to changed nutrient availability for plants is however weakly understood.
      
Effect of soil drying on growth, biomass allocation and leaf gas exchange of two annual grass species
      
The effect of soil drying on humus decomposition and nitrogen availability
      


The effects of soil drying on water relations, nitrogenase activity (measured as acetylene reduction activity), respiration activity and sucrose metabolism of Leucane leucocephala nodules were investigated under greenhouse condition. Water potential of nodules decreased steadily with increasing soil water deficit. Soil drying had a substantial inhibitive effect on acetylene reduction achvity (ARA) of nodules meased with an open-flow gas exchange system, so did...

The effects of soil drying on water relations, nitrogenase activity (measured as acetylene reduction activity), respiration activity and sucrose metabolism of Leucane leucocephala nodules were investigated under greenhouse condition. Water potential of nodules decreased steadily with increasing soil water deficit. Soil drying had a substantial inhibitive effect on acetylene reduction achvity (ARA) of nodules meased with an open-flow gas exchange system, so did the respiration rate and ATP content of nodules. Both alkaline invertase and sucrose synthase activities decreased significantly after the imposition of soil drying, which could explain the increase in sucrose concentration at the early stage of soil drying Nevertheless, the total soluble sugar content in nodules on drought-treated plants showed no obvious difference from that in nodules on well-watered plants, indicating that soil drought lowers the nitrogen fixation activity through the lowering of the respiratory activities, which diminishes the supply of energy by respiration in the form of ATP. This deduction was substantiated in an experiment with detached nodules. Respiration the and ATP content of nodules isolated from well-watered L. leucocephala plants decreased sigificantly after treatment with DNP, a respiratory inhibitor, for 30 min, so did the ARA. These results suggest that it may be through the decrease in respiration rate and thereby that in the supply of ATP that drought stress inhibits ARA of nodules.

在温室条件下研究了水分亏缺对银合欢根瘤的水分关系、固氮酶活性(乙炔还原活性)、呼吸活性以及蔗糖代谢有关酶活性的影响。随着土壤含水量的下降,根瘤水势也相继下降。土壤干旱不但显著地抑制了根瘤乙炔还原的活性,而且对根瘤的呼吸活性、ATP的产生以及催化蔗糖降解的碱性转化酶和蔗糖合成酶的活性也具强烈的抑制作用。然而,根瘤可溶性总糖含量则不受土壤干旱的影响。用呼吸抑制剂DNP处理根瘤后,其固氮酶活性、呼吸活性及ATPI含量都受到极显著的抑制。这都表明,水分胁迫对根瘤呼吸活性及ATP产生的抑制可解释干旱条件下固氮酶活性的下降。

Summary A pot experiment in greenhouse was carried out to study the effect of soil drying on CH_4 flux from rice paddy soil. The soil drying practice was Performed two times from 43 and 102 days respectively after rice transplanting, and the soil drying periods were 28 and 113 hours respectively. The results showed that a large amount of methane emitted to the atmosphere during 16 and 42 hours after the soils fell dry, and an emission Peak occurred quickly after the...

Summary A pot experiment in greenhouse was carried out to study the effect of soil drying on CH_4 flux from rice paddy soil. The soil drying practice was Performed two times from 43 and 102 days respectively after rice transplanting, and the soil drying periods were 28 and 113 hours respectively. The results showed that a large amount of methane emitted to the atmosphere during 16 and 42 hours after the soils fell dry, and an emission Peak occurred quickly after the soils fell dry when the soils was dry and soft. As soil drying continued, the soils began to crack and CH4 emissions decreased to nil. Soil drying accelerated the release of soil-entrapped methane. CH4 emissions during soil drying accounted for 5.96the 10.05% of the total seasonal emissions. Although soil drying increased CH4 emissions by 9.68%-145.94% during soil drying, CH. emissions from the soils once imposed by soil drying decreased by if.21.59%~54.45% during the Period flooded after soil drying, compared with that from the soils flooded continuously. Considering overall CH. emissions during soil drying and the Period flooded again, soil drying reduced CH4 emissions by 17.7--43.91 Per cent

本文通过温室盆栽试验研究了烤田对种稻土壤甲烷排放的影响。在水稻移栽后的第43天和102天各烤田一次,持续时间分别为28和113小时。结果表明种稻土壤在开始烤田后前 16和 42小时内有大量甲烷排放,且在烤田后不久土壤呈微于松软状态时出现甲烷排放高峰。随着烤田的延续,至土壤呈干裂状态时甲烷排放通量降为零。烤田能促进土壤闭蓄态甲烷的排放,烤田期间甲烷排放量占水稻生长期甲烷排放总量的5.96%~10.05%。虽然烤田期间烤田使土壤甲烷排放量增加了9.68%~145.94%,但重新淹水后经历烤田土壤较持续淹水土壤甲烷排放量减少了21.59%~54.45%。综合考虑烤田及重新淹水期间甲烷排放量,烤田使种稻土壤甲烷排放量减少了17.70%~43.91%。

 
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