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柱模型土壤结构理论值
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柱模型土壤结构理论值
柱模型选用4式、45式、55式3种孔隙形式作为组合因子。每种组合类型都有确定的孔隙度K%，都有确定的有效孔隙半径与土粒半径的比例系数A，孔隙度范围21.4603%～65.0112%。
R= Ar
A=0.4142﹙ε%+δ%γ%﹚+0.7013δ%β%﹚ ﹙1﹚
式中：ε—单粒百分含量；
δ—团粒百分含量；
β—55式团粒百分含量；
γ—45式团粒百分含量。
K%=〔0.2146ε%+δ%﹙0.5354γ%+0.6501β%﹚〕100% ﹙2﹚
当采用2%的百分含量作为间距，柱模型土壤结构理论值等值线见表1。利用式(1)和式﹙2﹚可以作出任意百分含量为间距的土壤结构理论值（附表）。经过实验证明，以2%的百分含量作为间距制成的土壤结构理论值（附表），可以满足试验精度的要求。
实际应用时，按土层土粒密度和土壤容重计算孔隙度，土壤结构理论值（附表）所列各种组合类型中，必有一个组合类型的孔隙度与实测土层孔隙度相同或之差最小，利用这个组合的β%、δ%、γ%、ε%值，计算出A值。
表1土壤结构理论值等值线表
团粒单粒 单粒ε% 团粒δ% | 55式ß% | 0 | 10 | 20 | 30 | 40 | 50 | 60 | 70 | 80 | 90 | 100 | |||
45式γ% | 100 | 90 | 80 | 70 | 60 | 50 | 40 | 30 | 20 | 10 | 0 | ||||
K% | 53.5427 | 54.6895 | 55.8364 | 56.9833 | 58.1301 | 59.2770 | 60.4238 | 61.5707 | 62.7175 | 63.8644 | 65.0112 | ||||
0 | 100 | A | 0.4142 | 0.4429 | 0.4716 | 0.5003 | 0.5291 | 0.5578 | 0.5865 | 0.6152 | 0.6439 | 0.6726 | 0.7013 | ||
10 | 90 | K% | 50.3346 | 51.3666 | 52.3988 | 53.4310 | 54.4631 | 55.4953 | 46.5275 | 57.5597 | 58.5918 | 59.6240 | 60.6561 | ||
A | 0.4142 | 0.4400 | 0.4659 | 0.4917 | 0.5175 | 0.5434 | 0.5693 | 0.5951 | 0.6209 | 0.6468 | 0.6726 | ||||
20 | 80 | K% | 47.1264 | 48.0347 | 48.9612 | 49.8787 | 50.7961 | 51.7137 | 52.6311 | 53.5486 | 54.4661 | 55.3836 | 56.3010 | ||
A | 0.4142 | 0.4372 | 0.4601 | 0.4831 | 0.5061 | 0.5291 | 0.5520 | 0.5750 | 0.5979 | 0.6209 | 0.6439 | ||||
30 | 70 | K% | 41.9183 | 44.7210 | 45.5236 | 46.3264 | 47.1292 | 47.9320 | 48.7348 | 49.5376 | 50.3403 | 51.1432 | 51.9459 | ||
A | 0.4142 | 0.4343 | 0.4544 | 0.4745 | 0.4946 | 0.5147 | 0.5348 | 0.5549 | 0.5750 | 0.5951 | 0.6152 | ||||
40 | 60 | K% | 40.7101 | 41.3978 | 42.0860 | 42.7741 | 43.4622 | 44.1503 | 44.8384 | 45.5265 | 46.2146 | 46.9028 | 47.5908 | ||
A | 0.4142 | 0.4314 | 0.4487 | 0.4651 | 0.4831 | 0.5003 | 0.5176 | 0.5348 | 0.5520 | 0.5692 | 0.5865 | ||||
50 | 50 | K% | 37.5020 | 38.0149 | 38.6484 | 39.2218 | 39.7952 | 40.3687 | 40.9421 | 41.5155 | 42.0889 | 42.6624 | 43.2358 | ||
A | 0.4142 | 0.4286 | 0.4429 | 0.4573 | 0.4716 | 0.4860 | 0.5003 | 0.5147 | 0.5291 | 0.5434 | 0.5578 | ||||
60 | 40 | K% | 34.2939 | 34.7520 | 35.2107 | 35.6695 | 36.1208 | 36.5870 | 37.0457 | 37.5045 | 37.9632 | 38.4219 | 38.8807 | ||
A | 0.4142 | 0.4257 | 0.4372 | 0.4486 | 0.4601 | 0.4716 | 0.4831 | 0.4946 | 0.5060 | 0.5176 | 0.5291 | ||||
70 | 30 | K% | 31.0857 | 31.4291 | 31.7730 | 32.1172 | 32.4612 | 32.8053 | 33.1494 | 33.4934 | 33.8375 | 34.1815 | 34.5256 | ||
A | 0.4142 | 0.4228 | 0.4314 | 0.4400 | 0.4486 | 0.4573 | 0.4659 | 0.4745 | 0.4831 | 0.4917 | 0.5003 | ||||
80 | 20 | K% | 27.8776 | 28.1061 | 28.3355 | 28.5649 | 28.7943 | 29.0236 | 29.2530 | 29.4824 | 29.7117 | 29.9411 | 30.1701 | ||
A | 0.4142 | 0.4199 | 0.4257 | 0.4314 | 0.4372 | 0.4429 | 0.4487 | 0.4544 | 0.4601 | 0.4659 | 0.4716 | ||||
90 | 10 | K% | 24.6694 | 24.7832 | 24.8979 | 25.0126 | 25.1273 | 25.2420 | 25.3567 | 25.4713 | 25.5860 | 25.7007 | 25.8154 | ||
A | 0.4142 | 0.4170 | 0.4199 | 0.4228 | 0.4257 | 0.4287 | 0.4314 | 0.4343 | 0.4372 | 0.4400 | 0.4429 | ||||
100 | 0 | K% | 21.4603 | 21.4603 | 21.4603 | 21.4603 | 21.4603 | 21.4603 | 21.4603 | 21.4603 | 21.4603 | 21.4603 | 21.4603 | ||
A | 0.4142 | 0.4142 | 0.4142 | 0.4142 | 0.4142 | 0.4142 | 0.4142 | 0.4142 | 0.4142 | 0.4142 | 0.4142 | ||||
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注：实际应用时，采用2%组距的表。——为A值土壤结构理论值（附表1）
https://blog.sciencenet.cn/blog-1348133-799457.html
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