西安理工大学西北旱区生态水利国家重点实验室,西安,710048
[ "姚珂涵(1995-),女,在读硕士研究生,主要从事土壤生态修复研究。E-mail:kehan_yao@163.com" ]
纸质出版:2020
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姚珂涵, 肖列, 李鹏, 等. 冻融循环次数和土壤含水率对油松林土壤团聚体及有效态微量元素的影响[J]. 水土保持学报, 2020,34(3):259-266.
YAO Kehan, XIAO Lie, LI Peng, et al. Effects of Freeze-thaw Cycle Times and Soil Moisture Content on Soil Aggregates and Available Trace Elements in Chinese Pine Forest Soil[J]. 2020, 34(3): 259-266.
姚珂涵, 肖列, 李鹏, 等. 冻融循环次数和土壤含水率对油松林土壤团聚体及有效态微量元素的影响[J]. 水土保持学报, 2020,34(3):259-266. DOI: 10.13870/j.cnki.stbcxb.2020.03.039.
YAO Kehan, XIAO Lie, LI Peng, et al. Effects of Freeze-thaw Cycle Times and Soil Moisture Content on Soil Aggregates and Available Trace Elements in Chinese Pine Forest Soil[J]. 2020, 34(3): 259-266. DOI: 10.13870/j.cnki.stbcxb.2020.03.039.
以王茂沟流域典型人工油松林土壤为对象,研究了不同冻融循环次数(0,3,9次)和不同土壤含水率(40%FC,60%FC,80%FC)条件下土壤团聚体组成和团聚体中4种有效态微量元素(Cu、Fe、Mn、Zn)的演变特征。结果表明:冻融循环次数增加显著增加了<0.25 mm粒径团聚体比例(P<0.01),降低了>2 mm粒径团聚体比例(P<0.01),从而导致团聚体平均重量直径(MWD)显著降低(P<0.01);土壤含水率增加显著降低了<0.25 mm粒径团聚体比例(P<0.01),增加了0.25~2,>2 mm粒径团聚体的比例,团聚体MWD值显著增加(P<0.01)。土壤含水率增加对土壤颗粒的团聚作用显著大于冻融循环作用对土壤团聚体的破坏作用。冻融循环作用降低了<0.25 mm粒径团聚体中有效态Cu和Fe的总量,增加了Mn和Zn的总量,同时增加了在>2 mm粒径团聚体中4种有效态元素的总量。土壤含水率增加降低了<0.25 mm粒径团聚体中4种有效态微量元素的总量,而在>2 mm粒径团聚体中其总量显著增加。土壤含水率升高能够抵消冻融循环次数增加对土壤团聚体的破坏作用,冻融循环作用和土壤含水率增加的协同作用提高了>2 mm粒径团聚体有效态微量元素的含量。
The present research evaluated the effects of the frequency of freeze-thaw cycles (FTC) (0
3
and 9 times) and initial soil water content (WC) (40%
60%
and 80% field capacity) on soil aggregate distribution and four aggregate associated available trace elements (Cu
Fe
Mn
Zn) in a typical Chinese pine forest soil in the Wangmaogou watershed. The results showed that FTC significantly increased the proportion of aggregates < 0.25 mm (P<0.01)
decreased the proportion of aggregates >2 mm (P<0.01)
thus significantly decreased the mean weight diameter (MWD) (P<0.01). Increased soil WC significantly decreased the proportion of aggregates <0.25 mm
increased the proportion of aggregates 0.25~2 mm and >2 mm
thus increased MWD. The increased effects of soil WC on MWD were much larger than the disruptive effects under FTC conditions. FTC significantly decreased the total amount of available Cu and Fe
and increased the total amount of Mn and Zn in < 0.25 mm aggregates. The total amount of the four available trace elements in>2 mm aggregates were significantly increased after FTC. Increased soil WC decreased the available trace elements content in <0.25 mm aggregates and increased in the >2 mm aggregates. The increased soil WC could offset the disruptive effects of FTC on soil aggregation
and FTC and the increase soil WC synergistically improved the available tract elements contents in >2 mm aggregate fractions.
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