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Effects of Hydrogel Amendment to Different Soils on Plant Available Water and Survival of Trees under Drought Conditions

机译：干旱条件下不同土壤水凝胶改良剂对植物有效水和树木存活的影响

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The effect of super absorbent polyacrylate (SAP) hydrogel amendment to different soil types on plant available water (PAW), evapotranspiration and survival of Eucalyptus grandis, Eucalyptus citriodora, Pinus caribaea, Araucaria cunninghamii, Melia volkensii, Grevil-lea robusta, Azadirachta indica, Maesopsis eminii and Terminalia superba was investigated. The seedlings were potted in 3 kg size polythene bags filled with sand, loam, silt loam, sandy loam and clay soils, amended at 0 (control), 0.2 and 0.4% w/w hydrogel. The tree seedlings were allowed to grow normally with routine uniform watering in a glass house set up for a period of eight weeks, after which they were subjected to drought conditions by not watering any further. The 0.4% hydrogel amendment significantly (p < 0.05) increased the PAW by a factor of about three in sand, two fold in silt loam and one fold in sandy loam, loam and clay soils compared to the control. Similarly, the addition of either 0.2 or 0.4% hydrogel to the five soil types resulted in prolonged tree survival compared to the controls. Araucaria cunninghammi survived longest at 153 days, while Maesopsis eminii survived least (95 days) in sand amended at 0.4% after subjection to desiccation. Evapotranspiration was reduced in eight of the nine tree species grown in sandy loam, loam, silt loam and clay soils amended at 0.4% hydrogel. It is probable that soil amendment with SAP decreased the hydraulic soil conductivity that might reduce plant transpiration and soil evaporation.
机译：改性聚丙烯酸酯（SAP）水凝胶对不同土壤类型的影响对植物可用水（PAW），蒸腾作用和桉树，柠檬桉，樟子松，南洋杉，Melia volkensii，Grevil-learobusta，Azadirachta indica，研究了印度洋的Maesopsis eminii和Terminalia superba。将幼苗盆栽在3kg大小的聚乙烯袋中，该聚乙烯袋充满沙子，壤土，淤泥质壤土，沙质壤土和粘土，在0（对照），0.2和0.4％w / w水凝胶下修正。使树木的幼苗在常规的均匀浇水的情况下在设置为八个星期的玻璃温室中正常生长，然后通过不再浇水使其处于干旱条件。与对照相比，0.4％的水凝胶改性剂显着（p <0.05）将PAW提高了约三倍，沙质壤土为两倍，沙质壤土，壤土和黏土为PAW的三倍。同样，与对照相比，在五种土壤类型中添加0.2％或0.4％的水凝胶可延长树木的存活时间。脱水后，南洋杉的最长生存时间为153天，而埃及伊斯鞭毛虫的生存时间最少（95天）。在修正为0.4％水凝胶的沙壤土，壤土，粉质壤土和粘土中生长的9种树种中，有8种的蒸散量减少了。用SAP改良土壤可能会降低水力土壤电导率，从而降低植物的蒸腾作用和土壤蒸发。

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