土壤水吸力空间分布规律的时间稳定性研究

该文分析了潘店乡(PDV,32km2)和封丘站(FQS,0.05km2)两个尺度下的土壤水吸力的时间稳定性,潘店乡布设39个测点,封丘站布设44个测点.每个测点埋设两根张力计,深度分别为20cm和40cm.PDV于2004年3月至5月共测定19次;FQS于2004年3月至7月共测定27次.研究结果表明:在这两个尺度下土壤水吸力都具有一定的时间稳定性,FQS明显优于PDV.灌溉对时间稳定性影响很大,土壤水吸力的稳定性在干湿交替时最差.PDV土壤水吸力的时间稳定性只在一个灌溉周期内存在,而FQS的时间稳定性可在整个灌溉周期、不同作物条件下持续.

Temporal stability of spatial distribution pattern of soil water tension at different scales

The temporal stability of soil water tension in an area of 32 km2 (Pandian Village, PDV) and in an experimental field of 0.05 km2 (Fengqiu experimental station, FQS) were analyzed. 39 and 44 measuring stations were set up in PDV and FQS, respectively. At each station, soil water tension was measured using two tensiometers at 20 cm and 40 cm depths. The soil water tension in PDV was measured 19 times from March 2004 to May 2004, and the soil water tension in FQS was measured 27 times from March 2004 to July 2004. The results show that temporal stability is existed in two scales, and FQS is priori to PDV. There is large influence of irrigation on the temporal stability of soil water tension, and the low temporal stability occurs as the transition from dry to wet. For PDV, temporal stability persists in an irrigation cycle, while for FQS, temporal stability was persists in the whole measuring period and different types of crops.