不同作物种植对光伏坡地土壤团聚体稳定性与有机碳的影响
Effects of cultivating different crops on soil aggregate stability and organic carbon content in photovoltaic slopes
李馨妤 1孙东滨 1张孟豪 1林晓钦 2钟鹤森 1庞煜龚 1周波 3张池1
作者信息
- 1. 华南农业大学资源环境学院,广州 510642
- 2. 广东省科学院生态环境与土壤研究所,广州 510650
- 3. 广东省农业科学院茶叶研究所/广东省茶树资源创新利用重点实验室,广州 510640
- 折叠
摘要
为探讨种植不同作物对坡地土壤团聚体分布及其有机碳含量变化特征的影响,在光伏农业坡地项目区内采集玉米、大豆、南瓜片区以及未种植区土壤样品(各处理分别记作YM、DD、NG、CK),测定不同片区的土壤机械稳定性团聚体和水稳定性团聚体的分布特征及其不同粒径(d＞2 mm、0.25 mm≤d≤2 mm、d＜0.25 mm)团聚体的有机碳含量,计算土壤团聚体破坏率,同时对土壤团聚体分布比例及其有机碳含量进行相关性分析.结果表明:与CK相比,种植活动使土壤的机械稳定性和水稳定性大团聚体分布比例显著降低,其破坏率显著升高(P＜0.05);而不同作物之间,土壤的团聚体破坏率表现为玉米＞大豆＞南瓜(P＜0.05),YM、DD较NG处理显著提高了44.2%和23.1%.与CK相比,种植区土壤有机碳及水稳定大团聚体有机碳的含量显著降低(P＜0.05);不同作物处理之间,NG处理的有机碳含量分别显著高于YM和DD处理19.3%和15.4%,且其不同粒级团聚体有机碳含量也显著高于YM和DD处理(P＜0.05).相关性分析结果显示,水稳定性大团聚体分布比例与土壤有机碳含量呈显著正相关(P＜0.05),与团聚体破坏率呈显著负相关,而微团聚体情况则相反(P＜0.05).研究表明,光伏农业坡地项目区种植作物造成土壤团聚体破坏及有机碳流失,但不同作物品种对其影响不同,其中南瓜种植对土壤扰动和有机碳流失的影响最小,是光伏农业坡地项目区的优选作物.另外,为了缓解项目区土壤团聚体破坏及有机碳流失,应补充土壤有机质,采取保护性耕作措施.
Abstract
To explore the influence of planting different crops on the distribution of soil aggregates and their organic carbon content on sloping land,soil samples were collected from four different patches in the photovoltaic(PV)agricultural slopes project area:corn(YM),soybean(DD),pumpkin(NG),and unplanted(CK).The distribution characteristics of mechanically stable soil aggregates,water-stable aggregates,and the organic carbon content of aggregates with different grain sizes(d＞2 mm,0.25mm≤d≤2 mm,d＜0.25 mm)in different soil patches were determined.The destruction rate of soil aggregates was calculated and the correlation between the distribution ratio of soil aggregates and the organic carbon content was analyzed.The results showed that,compared with CK,planting activities significantly reduced the proportion of mechanically stable and water-stable macroaggregates in the soil and increased their destruction rate(P＜0.05).Among different crops,the soil aggregate destruction rate was lowest for NG and highest for YM(P＜0.05),with YM and DD raising it by 44.2%and 23.1%compared with NG,respectively.The soil organic carbon content and water-stabilized macroaggregate organic carbon were also lower in the planting area than in CK(P＜0.05).Among crops,NG had the highest soil organic carbon content,19.3%and 15.4%higher than YM and DD,respectively,and had higher organic carbon contents in different grain-size aggregates(P＜0.05).Correlation analysis showed that the proportion of water-stable macroaggregates was positively correlated with soil organic carbon content(P＜0.05),and negatively correlated with aggregate destruction rate,whereas the opposite was true for microaggregates(P＜0.05).These results indicate that planting crops in the PV agricultural slopes led to soil aggregate destruction and organic carbon depletion,but the effects varied by crop type.Pumpkin planting causes the least soil disturbance and organic carbon loss,making it the most suitable crop for this PV agricultural slope project area.We also recommend adding soil organic matter and adopting conservation tillage practices to mitigate the negative impacts of planting activities on soil quality.
关键词
光伏农业/坡地/土壤/团聚体/有机碳Key words
photovoltaic agriculture/slope arable land/soil/aggregate/organic carbon引用本文复制引用
基金项目
广东省农业科技发展及资源环境保护管理项目(2022KJ161)
广东省自然科学基金项目(2021A1515011543)
出版年
2024
国家科技期刊平台
NSTL
万方数据