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首页> 外文期刊>Plant and Soil >Respiration from C3 plant green manure added to a C4 plant carbon dominated soil.
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Respiration from C3 plant green manure added to a C4 plant carbon dominated soil.

机译：C3植物绿肥的呼吸作用被添加到C4植物碳占主导的土壤中。

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Application of tree leaves (C3 plants) on maize (C4 plant) fields is an agroforestry management technology to restore or maintain soil fertility. The in situ decomposition of Sesbania sesban leaves or C3 sugar was studied for 4-8 days after application to a maize field in Kenya. By using the difference of～10o/oo in natural abundance of 13C between the endogenous soil C (mainly C4) and the applied C (C3), the contributions of the two C sources to soil respiration were calculated. The delta13C valueof the basal respiration was from -15.9 to -16.7o/oo. The microbial response to the additions of leaves and sugar to this tropical soil was immediate. Application of sesbania leaves gave an initial peak in respiration rates that lasted from one to lessthan 6 days, after which it levelled off and remained～2-3 times higher (230-270 mg Cthinm-2thinh-1) than the control respiration rates throughout the rest of the experiment (5-8 days). In the sugar treatment, there was no initial peak in respiration rate. The respiration rate was 170 mg Cthinm-2thinh-1 after 4 days. At the end of the experiments, after 4-8 days, as much as 14-17% of the added C had been respired and～60% of the total respiration was from the added sesbania leaves or C3 sugar. This non-destructive method allows repeated measurements of the actual rate of C mineralization and facilitates decomposition studies with high temporal resolution in the field.
机译：在玉米（C4植物）田地上应用树叶（C3植物）是一种恢复或维持土壤肥力的农林业管理技术。施用到肯尼亚玉米田后，研究了Sesbania sesban叶或C3糖的原位分解。利用内源性土壤C（主要为C4）与施用的C（C3）之间13C自然丰度的〜10o / oo差异，计算了两种碳源对土壤呼吸的贡献。基础呼吸的δ13C值为-15.9至-16.7o / oo。微生物对这种热带土壤中添加叶片和糖的反应迅速。施用芝麻叶可使呼吸频率出现一个初始峰值，持续时间从1天到少于6天，此后趋于平稳，并始终比对照呼吸频率高约2-3倍（230-270 mg Cthinm-2thinh-1）。实验的其余部分（5-8天）。在糖处理中，呼吸速率没有最初的峰值。 4天后呼吸频率为170 mg Cthinm-2thinh-1。在实验结束时，在4-8天后，大约有14-17％的添加碳被呼吸，大约60％的总呼吸来自添加的芝麻叶或C3糖。这种非破坏性方法允许重复测量C矿化的实际速率，并有助于在现场以高时间分辨率进行分解研究。

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