Chin J Plant Ecol ›› 2019, Vol. 43 ›› Issue (2): 165-173.DOI: 10.17521/cjpe.2018.0267
Special Issue: 生态系统碳水能量通量; 微生物生态学
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CAO Deng-Chao1,2,3,4,GAO Xiao-Peng1,2,3,*(),LI Lei1,2,3,GUI Dong-Wei1,2,3,ZENG Fan-Jiang1,2,3,KUANG Wen-Nong1,2,3,4,YIN Ming-Yuan1,2,3,4,LI Yan-Yan1,2,3,4,Aili PULATI5
Received:
2018-10-30
Accepted:
2019-02-01
Online:
2019-02-20
Published:
2019-06-04
Contact:
GAO Xiao-Peng
Supported by:
CAO Deng-Chao, GAO Xiao-Peng, LI Lei, GUI Dong-Wei, ZENG Fan-Jiang, KUANG Wen-Nong, YIN Ming-Yuan, LI Yan-Yan, Aili PULATI. Effects of nitrogen and phosphorus additions on nitrous oxide emissions from alpine grassland in the northern slope of Kunlun Mountains, China[J]. Chin J Plant Ecol, 2019, 43(2): 165-173.
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URL: https://www.plant-ecology.com/EN/10.17521/cjpe.2018.0267
Fig. 1 Daily precipitation, soil water-filled pore space (WFPS) at 20 cm depth, daily air temperature (Ta) and soil temperature (Ts) at 20 cm depth during the experimental period.
Fig. 2 Dynamic variation of daily N2O flux rate from grassland soil under different nitrogen and phosphorus addition treatments (mean ± SE). Arrow indicates date of nitrogen and phosphorus addition treatments. * indicates significant differences between treatments (p < 0.05). CK, control; N, nitrogen addition; N + P, nitrogen and phosphorus addition; P, phosphorus addition.
处理 Treatment | N2O排放通量 N2O emission (kg N·hm-2) | p |
---|---|---|
对照 CK | 0.50 ± 0.05B | |
氮添加 nitrogen addition | 1.45 ± 0.06A | 0.002 |
磷添加 phosphorus addition | 0.35 ± 0.02B | 0.025 |
氮磷混施 nitrogen + phosphorus addition | 0.52 ± 0.05B | 0.226 |
Table 1 Cumulative N2O emissions of grassland soil under different nitrogen and phosphorus addition treatments in alpine grassland in the northern slope of Kunlun Mountains, China (mean ± SE)
处理 Treatment | N2O排放通量 N2O emission (kg N·hm-2) | p |
---|---|---|
对照 CK | 0.50 ± 0.05B | |
氮添加 nitrogen addition | 1.45 ± 0.06A | 0.002 |
磷添加 phosphorus addition | 0.35 ± 0.02B | 0.025 |
氮磷混施 nitrogen + phosphorus addition | 0.52 ± 0.05B | 0.226 |
Fig. 3 Dynamic variation of soil dissolved organic carbon (DOC) content and pH under different nitrogen and phosphorus addition treatments in alpine grassland in the northern slope of Kunlun Mountains (mean ± SE). * indicates significant difference between treatments (p < 0.05). CK, control; N, nitrogen addition; N + P, nitrogen and phosphorus addition; P, phosphorus addition.
Fig. 4 Dynamic variation of soil NH4+-N, NO3--N and available P content under different nitrogen and phosphorus addition treatments in alpine grassland in the northern slope of Kunlun Mountains (mean ± SE). * indicates significant difference between treatments (p < 0.05). CK, control; N, nitrogen addition; N + P, nitrogen and phosphorus addition; P, phosphorus addition.
Fig. 5 Dynamic variation of soil microbial biomass nitrogen (MBN) and carbon (MBC) content under different nitrogen and phosphorus addition treatments in alpine grassland in the northern slope of Kunlun Mountains, China(mean ± SE). CK, control; N, nitrogen addition; N + P, nitrogen and phosphorus addition; P, phosphorus addition.
处理 Treatment | 地上部生物量 Above-ground biomass (g·m-2) | p |
---|---|---|
对照 CK | 192.78 ± 27.03A | |
氮添加 nitrogen addition | 192.13 ± 34.07A | 0.96 |
磷添加 phosphorus addition | 176.02 ± 30.45A | 0.62 |
氮磷交互 nitrogen + phosphorus addition | 178.57 ± 28.38A | 0.96 |
Table 2 Plant above-ground biomass under different nitrogen and phosphorus addition treatments in alpine grassland in the northern slope of Kunlun Mountains (mean ± SE)
处理 Treatment | 地上部生物量 Above-ground biomass (g·m-2) | p |
---|---|---|
对照 CK | 192.78 ± 27.03A | |
氮添加 nitrogen addition | 192.13 ± 34.07A | 0.96 |
磷添加 phosphorus addition | 176.02 ± 30.45A | 0.62 |
氮磷交互 nitrogen + phosphorus addition | 178.57 ± 28.38A | 0.96 |
硝态氮 NO3--N | 铵态氮 NH4+-N | 速效磷 AP | pH | 可溶性有机碳 DOC | 微生物生物量碳 MBC | 微生物生 物量氮 MBN | 土壤孔隙含水率 WFPS | 气温 Air temperature | 土壤温度 Soil temperature |
---|---|---|---|---|---|---|---|---|---|
-0.17 | -0.08 | -0.11 | 0.53** | 0.67** | -0.30* | -0.17 | -0.16 | -0.19 | 0.05 |
Table 3 Correlation coefficients of daily N2O flux rate with environmental variables in alpine grassland in the northern slope of Kunlun Mountains
硝态氮 NO3--N | 铵态氮 NH4+-N | 速效磷 AP | pH | 可溶性有机碳 DOC | 微生物生物量碳 MBC | 微生物生 物量氮 MBN | 土壤孔隙含水率 WFPS | 气温 Air temperature | 土壤温度 Soil temperature |
---|---|---|---|---|---|---|---|---|---|
-0.17 | -0.08 | -0.11 | 0.53** | 0.67** | -0.30* | -0.17 | -0.16 | -0.19 | 0.05 |
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