论文部分内容阅读
以5种草坪草为试材,通过盆栽模拟大田试验,研究了充足灌水和限制灌水条件下草坪草的蒸发规律;测定了干旱胁迫下草坪草的叶片相对含水量、叶绿素含量、外观质量等指标,结果表明:草坪草蒸散量日变化与温度变化规律相一致,在午后12:00~14:00时达到最高值,65%~70%的蒸散量集中在10:00~16:00;充分灌水和限制灌水2种条件下,草坪草的月平均蒸散量均表现为:高羊茅>多年生黑麦草>草地早熟禾>狗牙根>日本结缕草,冷季型草坪草大于暖季型草坪草;干旱胁迫下,草坪草的叶片含水量和外观质量均呈下降趋势,而叶绿素含量先增后减,在第3天达到最大值,此时的土壤含水量为最适含水量,体积百分比约为25%~28%。
Five kinds of turfgrass were used as tested materials to study the law of turfgrass evaporation under the condition of sufficient irrigation and limited irrigation through pot experiment. The relative water content, chlorophyll content and appearance quality of turfgrass were measured under drought stress The results showed that the diurnal variation of evapotranspiration was in accordance with the change of temperature, reaching the highest value at 12: 00-14: 00 in the afternoon and evapotranspiration of 65-70% concentrating at 10: 00-16: 00. The monthly average evapotranspiration of turfgrass under irrigation and limited irrigation were as follows: tall fescue> perennial ryegrass> Kentucky bluegrass> Bermudagrass> Zoysia japonica and cold-season turfgrass than warm-season turf Under drought stress, the leaf water content and appearance quality of turf grass showed a decreasing trend, but the content of chlorophyll increased first and then decreased and reached the maximum on the third day. At this time, the soil moisture content was the optimum water content, volume percentage About 25% to 28%.