Physiological responses of radiata pine roots to soil strength and soil water deficit.
Physiological responses of radiata pine roots to soil strength and soil water deficit.
复制标题
辐射松根系对土壤强度和土壤水分亏缺的生理反应。
DOI：
10.1093/treephys/20.17.1205
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发表时间：
2000
期刊：
影响因子：
4
通讯作者：
O. Sun
中科院分区：
文献类型：
--
作者：
C. Zou;R. Sands;O. Sun
我们通过测量在不同水势 (Psi(s)) 的聚乙二醇 4000 生根溶液中和 (ii) 在相同土壤基质势下不同土壤强度 (Q) 的土壤中生长的幼苗根节伸长区的渗透势 (Psi(pi)) 和产量膨压 (Y)，研究了辐射松 (Pinus radiata D. Don) 根对土壤强度和土壤水分亏缺的生理反应。 （PSI（米））。根伸长率 (Deltal/Deltat) 随着 Psi(s) 的降低而逐渐降低，并且与 Psi(pi) 的降低和膨胀压 (P) 的降低相关。渗透调节发生在 Psi(s) < -0.2 MPa 时。在 Psi(s) 为 -0.01 至 -1.0 MPa 的范围内，Psi(pi) 下降 0.3 MPa，而 P 下降 0.7 MPa。溶液实验中的平均 Psi 为 0.37 MPa，与 Psi(s) 没有显着差异 (P = 0.10)。随着 Q 从 0 增加到 3.0 MPa，根伸长率呈指数下降，并且由于 Psi(pi) 减少相同量，因此与 P 增加 0.11 MPa 相关。土壤实验中的平均 Y 为 0.49 MPa，并且随 Q 变化不显着（P = 0.87）。
We investigated physiological responses of radiata pine (Pinus radiata D. Don) roots to soil strength and soil water deficit by measuring the osmotic potential (Psi(pi)) and yield turgor (Y) in the elongation zone of root segments of seedlings growing (i) in polyethylene glycol 4000-containing rooting solution of different water potentials (Psi(s)) and (ii) in soil of different soil strengths (Q) at the same soil matric potential (Psi(m)). Root elongation rate (Deltal/Deltat) decreased progressively with decreasing Psi(s) and was associated with decreased Psi(pi) and decreased turgor pressure (P). Osmotic adjustment occurred at Psi(s) < -0.2 MPa. Over a range in Psi(s) of -0.01 to -1.0 MPa, Psi(pi) fell 0.3 MPa whereas P fell 0.7 MPa. Mean Psi in the solution experiment was 0.37 MPa and did not differ significantly with Psi(s) (P = 0.10). Root elongation rate decreased exponentially as Q increased from 0 to 3.0 MPa, and was associated with an increase in P of 0.11 MPa as a consequence of Psi(pi) decreasing by the same amount. Mean Y in the soil experiment was 0.49 MPa and did not change significantly with Q (P = 0.87).