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化肥配施有机肥对芹菜田土壤结构和有机碳组分的影响

2021-09-28王奉军胡轼林薛生玲李玉亮韩丽侯启雷王景功

甘肃农业科技 2021年9期

王奉军 胡轼林 薛生玲 李玉亮 韩丽 侯启雷 王景功

摘要:研究了不同施肥模式下芹菜田的土壤结构和有机碳组分变化。结果表明,化肥配施有机肥可降低土壤容重,提升土壤总孔隙度,提高水稳性团聚体含量,增加有机碳及其碳组分含量。其中以增施有机肥6 000 kg/hm2和4 500 kg/hm2处理的效果最为显著,建议该区芹菜在施用化肥的同时添加有机肥4 500~6 000 kg/hm2。

关键词:芹菜;有机肥;土壤结构;有机碳组分

中图分类号:S152.4        文献标志码:A        文章编号:1001-1463(2021)09-0021-06

doi:10.3969/j.issn.1001-1463.2021.09.006

Effects of Organic Fertilizer Combined with Chemical Fertilizer on Soil Structure and Organic Carbon Components in Celery Field

WANG Fengjun, HU Shilin, XUE Shengling, LI Yuliang, HAN Li, HOU Qilei, WANG Jinggong

(Lanzhou New District Agricultural Technology Development Co., Ltd.,Lanzhou Gansu 730000, China)

Abstract:The changes of soil structure and organic carbon components in celery fields under different fertilization modes were studied. The results showed that the combined application of chemical fertilizer with organic fertilizer could reduce soil bulk density, improve soil total porosity, increase the content of water-stable aggregates, and increase the content of organic carbon and its carbon components. Among them, the effect of adding organic fertilizer 6 000 kg/hm2 and 4 500 kg/hm2 was the most significant. It is suggested that 4 500 ~ 6 000 kg/hm2 organic fertilizer should be added to celery when fertilizer is applied.

Key words:Celery;Organic fertilizer;Soil structure;Organic carbon fraction

土壤碳库是陆地生态系统中最大的碳储库。土壤碳库的变化在陆地碳循环中发挥着重要的作用,土壤有机碳作为土壤碳库重要的组成之一,是影响土壤肥力的重要因素,是土壤质量的核心,对生态系统的碳循环产生重要影响[1 - 2 ]。土壤团聚体作为土壤结构最基本的单元,它的数量和质量直接影响着土壤性质和有机碳固存,它的组成和特性不仅是评估土壤侵蚀、板结等物理过程的一个关键指标,也被作为评价土壤质量的重要指标之一,同时也是维持土壤肥力的基础。土壤中有机碳的质量、含量与土壤团聚体结构有着密切的关联。土壤有机碳是土壤形成团聚体结构的主要影响因素,而有机碳的固定又是依靠土壤团聚体对土壤有机碳的物理保护作用来实现的[3 ]。根据土壤中有机碳的稳定性,可以将土壤有机碳分为活性有机碳和非活性有机碳。土壤活性有机碳是土壤中易氧化、分解和矿化的碳,包括微生物量碳、易氧化有机碳和可溶性有机碳等[4 ]。……

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