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荒漠生境下柠条幼苗存活与生长对水分添加和沙埋的响应

罗永红,闫兴富*,孙毅,张金峰   

  1. (国家民委生态系统模型及应用重点实验室,  北方民族大学生物科学与工程学院,  银川 750021)
  • 出版日期:2018-05-10 发布日期:2018-05-10

Responses of survival and growth of Caragana korshinskii seedlings to water addition and sand burial.

LUO Yong-hong, YAN Xing-Fu*, SUN Yi, ZHANG Jin-feng   

  1. (Key Laboratory of Ecosystem Model and Applications of State Nationalities Affairs Commission, College of Biological Science and Engineering, Beifang Minzu University, Yinchuan 750021, Ningxia, China).
  • Online:2018-05-10 Published:2018-05-10

摘要: 为了解柠条幼苗生长与存活对荒漠生境下沙埋和水分添加的响应,在宁夏灵武白芨滩国家级自然保护区南部荒漠灌丛群落,通过水分添加和持续沙埋处理,研究了柠条幼苗的存活与生长对水分添加和沙埋的响应。结果表明:水分添加有利于柠条幼苗的存活与生长,幼苗最终留存率显著提高(P<0.05),且幼苗株高、单株叶面积和总干质量显著增大(P<0.05),侧根数、小叶数、相对生长率和净同化率也均有不同程度增大。沙埋抑制柠条幼苗的存活与生长,试验结束时,沙埋幼苗在水分添加条件下的最终留存率显著低于无沙埋幼苗(P<0.05);除株高外,沙埋幼苗的基径、小叶数、单株叶面积、总干质量、相对生长率等均显著减小(P<0.05),主根长、侧根数和净同化率也不同程度减小。沙埋幼苗的比叶面积、比根长和比枝长均显著大于无沙埋幼苗(P<0.05),但前者的根冠比显著小于后者(P<0.05);沙埋幼苗的比根长在水分添加条件下显著减小(P<0.05),但不论是否沙埋,幼苗根冠比、比叶面积和比枝长在有无水分添加间均差异不显著。

关键词: 落叶松人工林, 碳组分, 氮组分, 微生物生物量, 间伐

Abstract: To understand the adaptive strategies of growth and survival ofCaragana korshinskii seedlings to sand burial and water availability in desert, an experiment was conducted in a desert shrubland in Lingwu Baijitan National Nature Reserve of Ningxia. The results showed that water addition facilitated the survival and growth of C. korshinskii seedlings. The final retention rate (FRR), shoot height (SH), leaf area per plant (LAPP) and total dry mass (TDM) of seedlings all significantly increased under water addition (P<0.05). Moreover, lateral root number (LRN), leaflet blade number (LBN), relative growth rate (RGR) and net assimilation rate (NAR) all increased to some extent. The survival and growth of C. korshinskii seedlings were inhibited by sand burial. The FRRs of seedlings with water addition were significantly higher than that without water addition by the end of the experiment (P<0.05). Basal stem diameter, LBN, LAPP, TDM, RGR of sand buried seedlings significantly decreased (P<0.05), but it was not the case for SH. The taproot length, LRN and NAR of seedlings declined in various degrees. The specific leaf area (SLA), specific root length (SRL) and specific shoot length (SSL) of sand buried seedlings were significantly higher than those without sand burial (P<0.05), while root shoot ratio (RSR) of the former was substantially lower than the latter (P<0.05). The SRL of sand buried seedlings significantly declined under water addition (P<0.05). No significant difference in RSR, SLA and SSL of seedlings, however, were detected between treatments of water addition and no water addition regardless of sand burial.

Key words: larch plantation, microbial biomass., carbon fraction, thinning, nitrogen fraction