摘要
通过对农业生态系统中 SPAC水分热力学函数——偏摩尔自由能 ( ΔG)、偏摩尔焓 ( ΔH)和偏摩尔熵 ( ΔS)的研究得出 :( 1 )高施磷水平下土壤植物间水分ΔG梯度较大 ,有利于土壤水分向植物体的运移 ;施肥增加土壤与植物间水分自由能梯度的影响要大于降低土壤水自由能的影响 ,从而增加了植物的“提水”作用 ,有利于植物对土壤水分的利用 ,这也是“以肥调水”的科学依据。( 2 )高施磷水平可以平抑不同土壤含水量所导致的土壤植物间水分 ΔG梯度的差异 。
The thermodynamics parameters,partial molal free energy( Δ ),partial molal enhalpy( Δ )and partial entropy( Δ ),of moisture in SPAC of agriculture ecosystem were studied,the results showed that the moisture ladder degree between soil and plant could increase under phosphate fertilizer application level.It was beneficial to transport of soil moisture from soil to plant.The increased value of Δ s-Δ p is greater than the decended value of Δ s and Δ p.Thus,the “absorption water effect” from soil of plant roots was been enhanced.It was the scientific foundation of what plant absorbed water was promoted by fertilizer as well.Higher phosphate fertilizer application level could inhabit the difference of moisture and increase soil moisture utilization ratio.
出处
《生态学报》
CAS
CSCD
北大核心
2000年第2期255-263,共9页
Acta Ecologica Sinica
基金
国家自然科学基金
