| This article has been：Browse 250Times Download 54Times |
scan it! |
|
|
| DOI：10.13522/j.cnki.ggps.2025221 |
|
| Soil water-holding capacity, nutrient characteristics, and their interrelationships in Wuyi Mountain National Park |
|
YU Bohang, FAN Qiangyong, CHENG Lin, ZHAO Yuze, CAO Shining, WANG Jianming
|
|
1. School of Ecology and Nature Conservation, Beijing Forestry University, Beijing 100083, China;
2. Wuyi Mountain National Park Jiangxi Authority, Shangrao 334500, China
|
| Abstract: |
| 【Objective】 The Wuyi Mountain in Southeastern China is characterized by complex topography and diverse soil types. This paper presents the results of an experimental study on water-holding capacity and nutrient content of soils at different depths in this region, aiming to provide a database to support ecosystem management and soil conservation strategies.【Method】The study focused on four types of soils in the region: red soil, yellow-red soil, yellow soil, and mountain meadow soil. Soil samples were collected from two depths: 0-15 cm and 15-30 cm at various locations over the region. For each sample, we measured soil saturated water content, total organic carbon, ammonium nitrogen, nitrate nitrogen, total organic nitrogen, total organic phosphorus, and total inorganic phosphorus. Wilcoxon rank-sum tests, Spearman correlation analysis and principal component analysis were used to analyze water- holding capacity, nutrient contents, and their interrelationships. 【Result】①Saturated water content and all nutrient indices in the topsoil soil layer (0-15 cm) were higher than those in the subsoil layer (15-30 cm) (P＜0.05). ②Except for nitrate nitrogen, saturated water content and all nutrient indices differed among the four soil types (P＜0.05), following the order: mountain meadow soil＞yellow soil＞yellow-red soil＞red soil. ③In the topsoil layer, saturated water content was positively correlated with all nutrient indices (P＜0.05), whereas in the subsoil layer, it was positively correlated with all nutrients except nitrate nitrogen (P＞0.05). ④Principal component analysis indicated that differences in water-holding capacity and nutrient properties were most pronounced between red soil and mountain meadow soil, with saturated water content, total organic carbon, and total organic nitrogen being the main contributors. ⑤The correlation between saturated soil water content and nutrient content varied by soil type: in red soil, it was negatively correlated with total organic phosphorus (P＜0.05); in yellow-red soil, it was insignificantly correlated with inorganic nitrogen (P＞0.05) but was significantly positively correlated with other nutrient indicators (P＜0.05); in yellow soil, it was insignificantly correlated with total inorganic phosphorus (P＞0.05) but significantly positively correlated with other nutrients (P＜0.05); in mountain meadow soil, it was significantly positively correlated with all three organic nutrients (P＜0.05).【Conclusion】Water-holding capacity and nutrient contents exhibited pronounced vertical differentiation in all four soil types. Their coupling relationships shifted from being dominated by physical- leaching processes in less fertile soils to being jointly regulated by organic matter accumulation in more fertile soils. |
| Key words: soil saturated water content; soil organic carbon; mountain meadow soil; principal component analysis |
|
|
