| 舒向阳,胡玉福,杨雨山,何佳,佘淑凤,贾安都,姜正博,孙锦杨.川西北草地沙化对土壤可溶性有机氮及酶活性的影响[J].干旱地区农业研究,2018,36(1):66~71 |
| 川西北草地沙化对土壤可溶性有机氮及酶活性的影响 |
| Soil dissolved organic nitrogen and enzyme activities at different desertification grasslands in Northwest Sichuan |
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| DOI：10.7606/j.issn.1000-7601.2018.01.10 |
| 中文关键词: 川西北草地 沙化 可溶性有机氮 土壤酶 |
| 英文关键词:grasslands in northwest Sichuan desertification dissolved organic nitrogen soil enzyme |
| 基金项目:国家支撑计划项目(2015BAC05B00)；四川省科技支撑计划项目(2014SZ0057)；川西北高寒草地沙化防治新模式的研究与示范(2014SZ0159) |
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| 中文摘要: |
| 为探究草地沙化对川西北高寒草地土壤可溶性有机氮及酶活性的影响，采用样地调查方法，研究了不同沙化程度草地可溶性有机氮、脲酶、蛋白酶、硝酸还原酶及精氨酸脱氨酶的变化特征。结果表明： 随草地沙化程度加剧，土壤脲酶、蛋白酶、硝酸还原酶及精氨酸脱氨酶活性显著降低。与未沙化草地相比，重度沙化草地0～20 cm土层脲酶、蛋白酶、硝酸还原酶及精氨酸脱氨酶活性分别降低了40.54%、30.68%、39.85%和44.00%； 土壤可溶性有机氮随沙化程度增加呈下降趋势，相较于未沙化，轻度沙化、中度沙化和重度沙化草地土壤可溶性有机氮含量分别下降了22.36%、48.72%和67.77%，且0～20 cm土层变化最为显著。 相关分析结果表明，酶活性与土壤氮素呈极显著正相关；硝酸还原酶与铵态氮、硝态氮、微生物量氮和可溶性有机氮的相关系数最高，分别达到0.868、0.850、0.789和0.701。 |
| 英文摘要: |
| In order to explore the changes of soil dissolved organic nitrogen and enzyme activities in the process of the alpine desertification grassland in Northwest Sichuan, we studied the dissolved organic nitrogen and the vertical distribution characteristics of urease, protease, nitrate reductase and arginine deaminase. The results showed that with the aggravation of desertification, all enzyme activities decreased sharply. Compared with the non-desertification grassland, the activities of urease, protease, nitrate reductase and arginine deaminase of the grassland were decreased by 40.54%, 30.68%、39.85% and 44.00% at 0～20 cm soil depth, respectively. With the increase of the degree of desertification, soil dissolved organic nitrogen showed a declining trend. Compared with the non-desertification grassland, the soil dissolved organic nitrogen concentrations of light desertification grassland, middle desertification grassland, serious desertification grassland were decreased by 22.36%, 48.72% and 67.77% respectively, especially at the 0～20 cm soil layer. Correlation analysis showed a significant positive correlation between soil enzyme activity and soil nitrogen. |
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