التفاصيل البيبلوغرافية
| العنوان: |
降雨频率变化对尕海湿草甸土壤氮组分的影响. (Chinese) |
| Alternate Title: |
Effects of rainfall frequency change on soil nitrogen components in Gahai wet meadow. (English) |
| المؤلفون: |
秦昊德, 李广, 吴江琪, 魏星星, 王海燕, 徐国荣 |
| المصدر: |
Arid Zone Research / Ganhanqu Yanjiu; Jul2022, Vol. 39 Issue 4, p1191-1199, 9p |
| مصطلحات موضوعية: |
RAINFALL frequencies, RAINFALL, CLIMATE change, NITROGEN cycle, SOIL depth, NITROGEN in soils, WETLAND soils |
| مصطلحات جغرافية: |
GANSU Sheng (China) |
| Abstract (English): |
In the context of global climate change, precipitation patterns have changed significantly, both in terms of rainfall frequency and amount of precipitation. Changes in precipitation patterns will significantly affect the ecosystem functions of wetlands, especially the process of soil nitrogen cycle transformation. To explore the effects of different rainfall frequencies on the soil ammonium nitrogen ( NH4+-N), nitrate nitrogen ( NO3--N), and total nitrogen (TN) of the Gahai wet meadow in Gannan (located in Gansu Province, China), we set five different rainfall frequencies by simulating extreme rainfall (25 mm irrigation) in the 2019 plant growth season, May-October: CK, natural rainfall only; DF1, watered once a week (19 times×25 mm); DF2, watered once every 2 weeks (9 times × 25 mm); DF3, watered once every 3 weeks (6 times×25 mm); and DF4, watered once every 4 weeks (4 times × 25 mm). All treatments were exposed to natural rainfall. The results showed that different rainfall frequencies have significant effects on the soil nitrogen components of the wet meadow (P < 0.05). The increase of rainfall frequency increased the soil NH4+-N and NO3--N content in the growing season, from May to October; the peak of NH4+-N and NO3--N increased significantly. Compared with CK, the increase in rainfall frequency increased the soil NH4+-N and NO3--N content and reduced the TN content. Among different rainfall frequencies, with the gradient of rainfall frequency increasing, the 0-40 cm layer NH4+-N and NO3--N showed a trend of first increasing and then decreasing and TN showed a trend of first decreasing and then increasing. Under different rainfall frequency treatments, the proportion of TN of NH4+-N in each soil layer was higher than that of NO3--N, and soil NH4+-N, NO3--N, and TN content decreased with the increase in soil depth. [ABSTRACT FROM AUTHOR] |
| Abstract (Chinese): |
为探究不同降雨频率对甘南尕海湿草甸土壤铵态氮（NH4+-N）、硝态氮（NO3--N）、全氮（TN）的影响，于 2019年植物生长季（5—10月），通过模拟极端降雨（25 mm灌溉量）设置5种不同降雨频率处理：CK只接收自然降 雨，DF1每周浇灌1次（19次×25mm），DF2每2周浇灌1次（9次×25 mm），DF3每3周浇灌1次（6次×25 mm），DF4每4 周浇灌1次（4次×25 mm）；所有处理均接收自然降雨。结果表明：不同降雨频率处理对尕海湿草甸土壤氮组分有显 著影响（P<0.05）。降雨频率的增加提高了5—10月土壤 NH4+-N 和 NO3--N 含量，NH4+-N 和 NO3--N 的峰值有显著 升高，两者的峰值并未提前出现；与CK相比，降雨频率的增加提高了土壤NH4+-N 和 NO3--N 含量，降低了TN含量； 而在不同降雨频率间，随降雨频率的梯度增加，0~40 cm土层 NH4+-N 和 NO3--N 均呈先增后减的趋势，TN呈先减后 增的趋势；不同降雨频率处理下，各土层 NH4+-N 的TN占比均高于NO3--N，且土壤 NH4+-N、NO3--N、TN含量均随土 层深度增加而降低。 [ABSTRACT FROM AUTHOR] |
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| قاعدة البيانات: |
Complementary Index |
