Effects of Dodonaea viscosa Afforestation on Soil Nutrients and Aggregate Stability in Karst Graben Basin

Lijun Liu, Guanglin Gou, Jinxia Liu, Xuebin Zhang, Qilin Zhu, Jinxia Mou, Ruoyan Yang, Yunxing Wan, Lei Meng, Shuirong Tang, Yanzheng Wu and Qiuxiang He
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Lijun Liu: College of Tropical Crops, Hainan University, Haikou 570228, China
Guanglin Gou: College of Tropical Crops, Hainan University, Haikou 570228, China
Jinxia Liu: College of Tropical Crops, Hainan University, Haikou 570228, China
Xuebin Zhang: College of Tropical Crops, Hainan University, Haikou 570228, China
Qilin Zhu: College of Tropical Crops, Hainan University, Haikou 570228, China
Jinxia Mou: College of Tropical Crops, Hainan University, Haikou 570228, China
Ruoyan Yang: College of Tropical Crops, Hainan University, Haikou 570228, China
Yunxing Wan: College of Tropical Crops, Hainan University, Haikou 570228, China
Lei Meng: College of Tropical Crops, Hainan University, Haikou 570228, China
Shuirong Tang: College of Tropical Crops, Hainan University, Haikou 570228, China
Yanzheng Wu: College of Tropical Crops, Hainan University, Haikou 570228, China
Qiuxiang He: College of Tropical Crops, Hainan University, Haikou 570228, China

Land, 2022, vol. 11, issue 8, 1-12

Abstract: Dodonaea viscosa is widely cultivated in the karst graben basin and is crucial for recovering land after rocky desertification. However, the effect of long–time D. viscosa afforestation on changes in the quality of soil remains unclear. Soil nutrients and aggregate composition can be used to evaluate the beneficial effects of afforestation of D. viscosa in improving soil functional stability. In this study, soil nutrients and aggregate stability were investigated using cropland, 10–year, 20–year, and 40–year D. viscosa afforestation and secondary succession shrub. Compared to the cropland, D. viscosa afforestation significantly increased the soil water content (WC), soil organic carbon (SOC), and total nitrogen (TN) contents, with an enhanced effect observed with prolonged afforestation. Soil nutrient contents under D. viscosa afforestation rapidly reached the level of the shrub. Dodonaea viscosa afforestation promoted the formation of >2 mm aggregates and decreased the ratio of 0.053–0.25 mm aggregates, which varied with afforestation years. Compared to the cropland, the content of >0.25 mm water–stable aggregates (R >0.25 ), mean weight diameter (MWD), and geometric mean weight diameter (GMD) of soil increased exponentially. However, soil erodibility factor (K) and unstable aggregates index (E It ) decreased exponentially with prolonged D. viscosa afforestation, and the latter two indicators did not reach the level of the shrub. These results indicated that soil nutrients, aggregate stability, and erosion resistance increased with prolonged D. viscosa afforestation. However, the aggregate stability and erosion resistance exhibited by D. viscosa could not reach the level of secondary shrub for a long time.

Keywords: karst graben basin; Dodonaea viscosa; soil nutrients; aggregate composition; aggregate stability (search for similar items in EconPapers)
JEL-codes: Q15 Q2 Q24 Q28 Q5 R14 R52 (search for similar items in EconPapers)
Date: 2022
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