Effect of soil water content variation on the least limiting water range

被引:45
作者
daSilva, AP [1 ]
Kay, BD [1 ]
机构
[1] UNIV GUELPH, DEPT LAND RESOURCE SCI, GUELPH, ON N1G 2W1, CANADA
关键词
D O I
10.2136/sssaj1997.03615995006100030024x
中图分类号
S15 [土壤学];
学科分类号
0903 ; 090301 ;
摘要
The least limiting water range (LLWR), a proposed structural quality index, is the range in soil water content within which plant growth is least limited by water potential, aeration, and mechanical resistance. This study tested the hypotheses that the frequency of the soil water content falling outside the LLWR (p(out)) increases with decreasing LLWR and that the relation is influenced by tillage, position (row vs. interrow), and climatic conditions. Thirty-two paired sampling sites were located along two parallel transects in a side by side comparison of no-till and conventional tillage. The transects crossed three soil types: Aquic Hapludalf, Psammentic Hapludalf, and Typic Hapludalf. The LLWR was calculated for the 0- to 20-cm depth at row and interrow positions. The site was planted to corn (Zea mays L.) and the study lasted three growing seasons. Logistic regression analysis, p(out) = exp(b(0) + b(1) LLWR)/[1 + exp(b(0) + b(1) LLWR)] showed that p(out) was negatively related to LLWR (R-2 = 0.72, P > 0.01), regardless of weather, tillage, or position. Values of p(out) under no-till were Lower than under conventional tillage and the interrow position had a lower p(out) than the row position. The parameter b(1) did not vary across weather, tillage, or position but b(0) was influenced by these parameters. The analyses supported the hypothesis and emphasized the impact on p(out) of factors unrelated to structure.
引用
收藏
页码:884 / 888
页数:5
相关论文
共 12 条
[1]  
[Anonymous], 2 CTR LAND BIOL RES
[2]  
[Anonymous], 1985, ADV SOIL SCI, DOI DOI 10.1007/978-1-4612-5046-3_8
[4]   Estimating the least limiting water range of soils from properties and management [J].
daSilva, AP ;
Kay, BD .
SOIL SCIENCE SOCIETY OF AMERICA JOURNAL, 1997, 61 (03) :877-883
[5]   CHARACTERIZATION OF THE LEAST LIMITING WATER RANGE OF SOILS [J].
DASILVA, AP ;
KAY, BD ;
PERFECT, E .
SOIL SCIENCE SOCIETY OF AMERICA JOURNAL, 1994, 58 (06) :1775-1781
[6]  
KAY BD, 1989, NATO ADV SCI I E-APP, V172, P223
[7]  
Myers R. H., 1990, Classical and Modern Regression with Applications
[8]  
*SAS I, 1991, SAS STAT PROC GUID P
[9]  
TOLLNER EW, 1984, J SOIL WATER CONSERV, V39, P73
[10]   TEMPORAL STABILITY OF SPATIALLY MEASURED SOIL-WATER PROBABILITY DENSITY-FUNCTION [J].
VACHAUD, G ;
DESILANS, AP ;
BALABANIS, P ;
VAUCLIN, M .
SOIL SCIENCE SOCIETY OF AMERICA JOURNAL, 1985, 49 (04) :822-828