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| Soil nitrogen mineralization characteristics on typical vegetation community of riparian buffer strip in Danjiangkou Reservoir |
| ZHAN Haige, JIANG Juan, HAO Haoxin, YANG Caidi, GUO Zhonglu |
| Research Center of Soil and Water Conservation, Huazhong Agricultural University, 430070, Wuhan, China |
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Abstract [Background] The soil nitrogen mineralization is controlled by various factors, including environmental factors, soil properties and plant residue qualities, etc. The objectives of our study are to clarify the soil mineralization characterization in typical vegetation community of riparian buffer strip in the Danjiangkou Reservoir, and to understand the correlation between plant chemical properties and soil nitrogen mineralization. [Methods] The soil used in experiment was collected from the upper 10 cm of the riparian buffer strips at 20 m interval. The leaves and roots of two typical plant species (Abutilon theophrasti Medicus and Cnidium monnier L. Cuss) from riparian buffer strips were collected, dried, cleaned, and ground for the incubation experiment and chemical analysis. Soil, ground leaves and roots were mixed as 9 treatments of control (CK without any plants added), single A. theophrasti leaf (QL) and single C. monnier leaf (SL), single A. theophrasti root (QR) and single C. monnier root (SR), mixed leaf and/or root (QL+SL, QL+SR, QR+SL, and QR+SR) for the laboratory incubation experiment. The soil mineralization rates were measured after 1, 3, 7, 14, 21, 31, 41, 51 and 61 day(s) of incubation. [Results] 1) There were 3 stages on soil mineralization after adding plants: the first stage (day 1-7) in which the rates of nitrogen mineralization declined, the second stage (day 7-41) in which the rates of nitrogen mineralization increased remarkably, and the last stage (day 41-61) in which the rates of nitrogen mineralization stayed in steady. The rates of soil mineralization in all treatments were less than that in the control (CK) of 79.53 mg/kg, the one with only A. theophrasti leaf (QL) was the highest with 71.62 mg/kg among single treatments, while the mixed treatment with the A. theophrasti leaf+C. monnier root treatment (QL+SR) resulted in the highest mineralization rate of 26.43 mg·kg-1 among the mixed treatments. 2) The content of soil microbial biomass increased significantly after adding plant residues (P < 0.05) as the order in: QL>all 4 mixed treatments>other 3 single treatments (except QL). 3) A significant correlation (P < 0.05) presented between soil N mineralization and the contents of total carbon and total nitrogen of plants during the whole experiment. The Principal Component Analysis (PCA) showed that the plant nitrogen content possessed the largest proportion in all factors, the significance was followed as: N> C:N> Cellulose> L:N> Polyphenols. 4) All the measured N mineralization rates were significantly less than the predicted values (P < 0.01). [Conclusions] These results indicated that added plants restrained the soil nitrogen mineralization, and mixed treatments of root and leaf did not promote combined effect. This study may provide a reference basis for the regional restoration of vegetation, soil and water conservation, and the pollution control of non-point resources.
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Received: 21 June 2016
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