Beijing Key Laboratory for Agricultural Application and New Technique, Beijing Advanced Innovation Center for Tree Breeding by Molecular Design, College of Plant Science and Technology, Beijing University of Agriculture, Beijing, China.
Beijing Bei Nong Enterprise Management Co. Ltd, Beijing, China.
J Sci Food Agric. 2020 Jun;100(8):3445-3455. doi: 10.1002/jsfa.10380. Epub 2020 Apr 6.
Using nutrient-rich animal wastes as organic fertilizers in agricultural practices is a sustainable method for soil amendment and avoiding environmental pollution. In order to evaluate their practical effect, we applied different proportions of animal waste as fertilizers to wet or dry soils that were either planted or not planted with young walnut trees.
The results showed that animal waste could increase soil C accumulation and carbon to nitrogen (C/N) ratio and reduce soil organic nitrogen and total nitrogen contents as well as the nitrogen to phosphorus (N/P) ratio in the planted group soil. This framework of soil C and N composition (a high C/N ratio) resulted in high N and Mg contents as well as high Cu and Zn contents in the leaves of the young trees as well as a high dry matter weight/leaf N ratio, causing increased leaf photosynthesis, reduced transpiration and relatively high water use efficiency under soil drought conditions. Also, animal wastes as fertilizers caused the branching of walnut to switch from elongation growth to thickening growth under soil drought conditions.
Principal component analysis and redundancy analysis demonstrated the mechanism by which the soil C/N ratio mediates the flux of available nutrients from the soil to the plant and thereby regulates plant dry matter accumulation and branching architecture under soil drought conditions. The results of this study provide new insights into the improvement of hilly soils using animal waste. © 2020 Society of Chemical Industry.
在农业实践中，使用富含营养的动物粪便作为有机肥料是一种改良土壤和避免环境污染的可持续方法。为了评估其实际效果，我们将不同比例的动物粪便作为肥料应用于种植或未种植年轻核桃树的湿地或旱地土壤中。
结果表明，动物粪便可以增加土壤 C 积累和碳氮比（C/N），降低种植组土壤中的有机氮和全氮含量以及氮磷比（N/P）。这种土壤 C 和 N 组成的框架（高 C/N 比）导致年轻树木叶片中的 N 和 Mg 含量以及 Cu 和 Zn 含量较高，以及干物质重量/叶片 N 比较高，从而在土壤干旱条件下增加叶片光合作用，减少蒸腾作用，相对提高水分利用效率。此外，在土壤干旱条件下，动物粪便作为肥料会导致核桃的分枝从伸长生长转变为加粗生长。
主成分分析和冗余分析表明，土壤 C/N 比调节土壤中有效养分向植物的通量的机制，从而调节土壤干旱条件下植物干物质积累和分枝结构。本研究结果为利用动物粪便改良丘陵土壤提供了新的见解。 © 2020 英国化学学会。
