1. 中国林业科学研究院 荒漠化研究所,北京,100091
2. 甘肃省水土保持科学研究所,甘肃,兰州,730020
3. 西安理工大学,陕西,西安,710048
4. 甘肃省水利厅水土保持局,甘肃,兰州,730000
纸质出版:2018
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马涛, 贾志清, 周波, 等. 黄土丘陵区不同土地利用类型土壤呼吸及其与温度和水分的关系[J]. 水土保持通报, 2018,38(1):82-88.
MA Tao, JIA Zhiqing, ZHOU Bo, et al. Soil Respiration of Different Land Uses and Its Relation to Water and Temperature in Hilly Area of Loess Plateau[J]. Bulletin of Soiland Water Conservation, 2018, 38(1): 82-88.
马涛, 贾志清, 周波, 等. 黄土丘陵区不同土地利用类型土壤呼吸及其与温度和水分的关系[J]. 水土保持通报, 2018,38(1):82-88. DOI: 10.13961/j.cnki.stbctb.2018.01.014.
MA Tao, JIA Zhiqing, ZHOU Bo, et al. Soil Respiration of Different Land Uses and Its Relation to Water and Temperature in Hilly Area of Loess Plateau[J]. Bulletin of Soiland Water Conservation, 2018, 38(1): 82-88. DOI: 10.13961/j.cnki.stbctb.2018.01.014.
[目的
]
分析黄土丘陵区不同土地利用类型土壤呼吸速率释放特征,为揭示该区域不同立地类型C循环特征奠定基础。[方法
]
采用LI-8100土壤碳通量测量系统于2014年11月至2015年7月,对标准径流小区红豆草、苜蓿、撂荒地和梯田苜蓿、沙打旺5种地类土壤呼吸速率及其地表温度、土壤温度(5 cm)、土壤含水量进行观测。[结果
]
①土壤呼吸速率日变化表现为昼高夜低的单峰型曲线,与温度的变化趋势一致,年均土壤呼吸速率表现为:沙打旺(梯田)2.27 μmol/(m
2
·s) > 红豆草1.79 μmol/(m
2
·s) > 苜蓿1.77 μmol/(m
2
·s) > 苜蓿(梯田)1.62 μmol/(m
2
·s) > 撂荒地0.77 μmol/(m
2
·s);②土壤呼吸速率呈现明显的季节变化特征,夏季最高,春季和秋季次之,冬季最低。夏季与春、秋、冬3季土壤呼吸速率差异显著(p
<
0.05);③土壤呼吸速率与地表温度和土壤温度(5 cm)的相关性均达到显著水平(p
<
0.05)。除撂荒地外,各样地土壤呼吸速率与土壤温度(5 cm)的相关度均高于其与地表温度的相关度,各样地土壤温度(5 cm)Q
10
值介于1.94~3.00;④土壤呼吸速率与土壤含水量之间线性相关不显著(p>0.05),但与土壤温度(5 cm)和土壤含水量的交互作用显著相关(p
<
0.01)。[结论
]
梯田土壤呼吸速率总体表现优于坡地,裸露地表在恢复植被的过程中,土壤环境质量显著提升。
[Objective] The characteristics of soil respiration rates were studied in different land use types of the hilly region in the Loess Plateau in order to investigate the features of the carbon cycle of different land use types.[Methods] Soil carbon flux of five land use types such as Onobrychis viciifolia
Medicago sativa
abandoned land
M. sativa with terraces and Astragalus adsurgens in standard runoff plots were monitored by LI-8 100 system
the surface temperature
soil temperature at 5 cm and soil moisture were monitored.[Results] ① The diurnal variation of soil respiration rates showed peak curves with higher in the day time and lower in the night time
which showed the same trend with temperature. The annual soil respiration rates were as follows:A. adsurgens (terraced)[2.27 μmol/(m2·s)] > O. viciaefolia[1.79 μmol/(m2·s)] > M. sativa[1.77 μmol/(m2·s)] > M. sativa (terraced)[1.62 μmol/(m2·s)] > abandoned land[0.77 μmol/(m2·s)]. ② Soil respiration rates showed obvious seasonal variation
and the highest appeared in summer
followed by spring and summer
the lowest was in winter. There were significant differences of soil respiration rates between summer and other seasons(p<0.05). ③ The correlation between soil respiration rates
surface and soil temperature were significant in different land use types (p<0.05). The correlation between soil respiration rate and soil temperature was higher than that of surface temperature in all the land use types except abandoned land
soil temperature values (5 cm) Q10 of each site varied from 1.94 to 3.00. ④ No significant linear relationship was found between soil respiration rates and soil moisture (p>0.05)
whereas significant correlation was exhibited between soil respiration rate and the interactions of soil temperature with soil moisture (p<0.01).[Conclusion] Soil respiration rates of terrace are better than slope land
and the soil quality was significantly improved by vegetation restoration.
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