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Spatial and temporal effects of nitrogen addition on root life span of Leymus chinensis in a typical steppe of Inner Mongolia

机译:内蒙古典型草原氮素添加对羊草根系寿命的时空影响

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1. To understand root dynamics of the native, perennial clonal grass Leymus chinensis in Inner Mongolia steppe, we examined spatial and temporal effects of N addition on root survivorship and longevity traits of L. chinensis by studying responses of survivorship of roots distributed in three soil layers (0-10, 10-20 and 20-30 cm) and born in three seasons (spring, summer and autumn) to N addition with modified rhizotron technique during the growing seasons of 2004-05. Kaplan-Meier analysis was used to generate survival functions and to estimate mean root life spans. 2. Roots in the three soil layers displayed similar life spans with mean overall value of 81 days in the control plots. N addition reduced life span of roots in the soil layers of 0-10 cm and 20-30 cm, but it had no effect on life span of roots in the soil layer of 10-20 cm. 3. Roots born in the three seasons differed in their life spans with the life span values of 21-58, 60-153 and 101-151 days for those roots born in spring, summer and autumn, respectively. N addition markedly reduced life span of roots born in summer in the three soil layers with the greatest reduction occurring in roots present in soil layer of 20-30 cm, but it had marginal effect on life span of the spring-born and autumn-born roots. 4. The differential sensitivity of survivorship and longevity of L. chinensis roots occurred in different soil depths and born in different seasons to N addition highlights the importance of spatial and temporal characteristics of roots in response to soil N availability in Inner Mongolia steppe.
机译:1.为了解内蒙古草原多年生无性系草羊草的根系动态,我们通过研究分布在三种土壤中的根系的存活反应,研究了氮素添加对时兴草的根系存活和长寿性状的时空影响。层(0-10厘米,10-20厘米和20-30厘米),并在2004-05的生长季节中使用改良的根管技术在三个季节(春季,夏季和秋季)添加N。 Kaplan-Meier分析用于生成生存函数并估计平均根寿命。 2.在对照样地中,三个土壤层的根系显示出相似的寿命,平均总价值为81天。施氮减少了0-10 cm和20-30 cm土层根系的寿命,但对10-20 cm土层根系寿命没有影响。 3.三个季节出生的根的寿命不同,春季,夏季和秋天出生的根的寿命值分别为21-58、60-153和101-151天。氮的添加显着缩短了三个土壤层中夏季出生的根的寿命,其中最大的减少发生在土壤层中存在的20-30 cm的根中,但它对春季和秋季出生的根的寿命影响很小根。 4.不同土壤深度和不同季节出生的羊草根系存活率和寿命对氮的敏感性不同,这突出了内蒙古草原根系时空特征对土壤氮素供应的响应的重要性。

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