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首页> 外文期刊>Arid Land Research and Management >Changes in soil organic carbon and total nitrogen stocks in response to walnut plantation in the southern region of the Loess Plateau, China
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Changes in soil organic carbon and total nitrogen stocks in response to walnut plantation in the southern region of the Loess Plateau, China

机译：中国黄土高原南部地区核桃种植的土壤有机碳和总氮股的变化

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摘要

Afforestation of croplands has been widely adopted on the semi-arid Loess Plateau in recent decades. However, knowledge of soil carbon and nitrogen changes after afforestation is still limited because of the complexity of afforestation approaches. Therefore, an experiment was conducted on two dominant arable soils (tableland soil and terrace soil) on the southern Loess Plateau to evaluate the impact of two afforestation approaches (walnut monocultures and walnut-based agroforestry) on the soil organic carbon (SOC) and soil total nitrogen (STN) content within 2 m soil profiles. In the tableland soil, compared with the continuous crop monoculture (135.90 t C ha(-1)), SOC stocks in the agroforestry and walnut monoculture system increased by 7.91% and 1.91%, respectively. While in the terrace soil, compared with crop monoculture (102.95 t C ha(-1)), SOC stocks in the agroforestry and walnut monoculture system decreased by 3.86% and 0.20%, respectively. The STN stock was lower in the tree monocultures and SOC content was significantly correlated with STN. Afforestation increased the SOC and STN stocks in the 0-10 cm soils, but decreased them in the 10-60 cm soils. In the deep soil layers (60-200 cm), SOC content increase was only found in agroforestry in the tableland soil, and no significant differences were found in the terrace soil. Converting cropland to agroforestry has advantages in terms of soil carbon sequestration.
机译：近几十年来，农田的植树征已被广泛采用了半干旱黄土高原。然而，由于造林方法的复杂性，造林后的土壤碳和氮气变化的了解仍然有限。因此，在南黄土高原上的两个主要耕地（Tableland土壤和露台土壤）上进行了实验，以评估两种造林方法（核桃单栽培和核桃族农牧）对土壤有机碳（SoC）和土壤的影响2米土壤剖面内的总氮（STN）含量。在Tableland土壤中，与连续作物单一栽培（135.90 T C HA（-1））相比，农林素和核桃单栽培系统的SoC库存分别增加了7.91％和1.91％。而在露台土壤中，与作物单一栽培（102.95吨（-1））相比，农业剧和核桃单栽培系统中的SoC库存分别下降了3.86％和0.20％。树木植物在树上较低，SOC含量与STN显着相关。造林在0-10厘米的土壤中增加了SOC和STN库存，但在10-60厘米的土壤中降低了它们。在深层土壤层（60-200厘米）中，SoC含量增加仅在Tableland土壤中的农林制剂中发现，并且在露台土壤中没有发现显着差异。将农田转换为农林别品种在土壤碳封存方面具有优势。

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