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首页> 外文期刊>Plant and Soil >Carbon mineralization in soil of roots from twenty crop species, as affected by their chemical composition and botanical family
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Carbon mineralization in soil of roots from twenty crop species, as affected by their chemical composition and botanical family

机译：二十种作物根系土壤中的碳矿化作用，受其化学成分和植物科的影响

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Our objective was to relate chemical composition of roots of a wide range of annual crops to root decomposition, so as to assess roots potential contribution to soil carbon (C). Roots from 20 different crops and 4 botanical families, collected under field conditions were incubated in soil for 120 days at 25 A degrees C. The initial chemical composition of roots was determined. The C mineralization was assessed by the continuous measurement of CO2 release and using single exponential model. PCA analysis was used to explore qualitative pattern in root quality and decomposition. PCA analysis showed that chemical characteristics (traits) differentiated plant families. The mineralization of root C varied greatly in terms of kinetics and in the total amount of C mineralized (36 % to 59 % of added C). Mineralization constant (k value) was negatively correlated with hemicelluloses and positively with N content. Poaceae roots that combined high hemicelluloses, low cellulose and low total N, showed low degradation rate and cumulative C mineralization. The chemical composition of roots, as for the above-ground parts of plants, can correctly predict their rate of decomposition in soils. The taxonomic affiliation enhances the understanding of the chemical determinants of quality of roots.
机译：我们的目标是将多种一年生作物的根的化学组成与根分解相关联，以评估根对土壤碳（C）的潜在贡献。在田间条件下收集的来自20种不同农作物和4个植物科的根在25 A摄氏度的土壤中孵育120天。确定了根的初始化学组成。通过连续测量CO2释放并使用单指数模型评估C矿化程度。 PCA分析用于探索根质量和分解的定性模式。 PCA分析表明，化学特性（性状）区分了植物科。根系C的矿化在动力学和矿化的C总量（添加的C的36％至59％）方面变化很大。矿化常数（k值）与半纤维素呈负相关，与氮含量呈正相关。结合了高半纤维素，低纤维素和低总氮的禾本科根系显示出较低的降解速率和累积的C矿化作用。对于植物的地上部分，根的化学成分可以正确预测其在土壤中的分解速率。分类隶属关系可增进对根质量的化学决定因素的了解。

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