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| Effects of management modes on soil aggregate stability and contents of carbon and nitrogen in tea garden |
| YANG Xiang1, JIN Qiang1, LI Xiande2, LIU Xuyang1, YIN Xiaolei1, WANG Weiqi1, ZHANG Yongxun2 |
1. School of Geographical Sciences, Fujian Normal University, 350007, Fuzhou, China;
2. Institute of Agricultural Economics and Development, Chinese Academy of Agricultural Sciences, 100081, Beijing, China |
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Abstract [Background] This paper explored the influence of different tea garden management modes on the stability of soil aggregates and the carbon and nitrogen content, moreover, clarified the factors affecting the stability of aggregates, which will provide scientific basis for soil erosion prevention, scientific management of tea gardens, and the sustainable development of agricultural cultural heritage sites. [Methods] The typical Tieguanyin tea garden soils were selected as the research object in Anxi, Fujian province. The 0-30 cm soil layer were collected under different tea garden management modes:routine management mode (M1), intercropping mode (M2) and modern technology mode (M3). Wet sieve method was used to obtain soil aggregates of four particle sizes. Mean weight diameter (MWD), the geometric mean diameter (GMD) and fractal dimension (D) indicated the stability of the aggregates, and the soil carbon and nitrogen content were measured by carbon and nitrogen element analyzer. The data were processed and analyzed by software such as SPSS and Cannoco. [Results] 1) Compared with M1, the soil pH of M2 and M3 both decreased. The soil electrical conductivity of M2 was significantly higher than that of M1 in each soil layer, but the soil bulk density was not significantly different in each treatment. 2) In M1, M2 and M3 modes, aggregates with particle size >0.25 mm were dominant.3) The stability of soil aggregates was M1>M2>M3. 4) Soil carbon and nitrogen contents of M2 and M3 treatments were higher than those of other management modes in M1 mode of 0-30 cm soil layers. 5) Soil pH were positively correlated with MWD and GMD (P<0.01), and negatively correlated with D (P<0.01). Moreover, D was negatively correlated with MWD, and GMD (P<0.01). Redundancy analysis showed that soil pH was the main factor affecting the distribution and stability of soil aggregates in tea gardens. [Conclusions] On the whole, there were significant differences in the stability characteristics of tea garden soil aggregates under different management modes. Management mode affected the distribution and stability of soil aggregates by changing the physical and chemical properties of tea garden soil.
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Received: 15 March 2021
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