华南农业大学学报2018，Vol.39Issue(2)：54-61,8.DOI:10.7671/j.issn.1001-411X.2018.02.009
土壤含水量对降香黄檀树干呼吸速率、生长和氮含量的影响
Effects of soil moisture content on stem respiration rate, stem growth and sapwood nitrogen content in Dalbergia odorifera
摘要
Abstract
[Objective]To provide basic data for following study of heartwood formation of Dalbergia odorifera.[Method]Four soil moisture content gradients including heavy drought (HD), light drought (LD), dry-season irrigation (DI) and control (CK) were artificially simulated to investigate the effects of soil moisture content on predawn shoot water potential (Ψpd), stem respiration rate (Rs), stem growth, and sapwood nitrogen content and their change characteristics in dry season.[Result]Soil moisture content and Ψpd declined continuously in dry season, and significant differences were observed among different treatments since the end of November.Rs increased exponentially with stem temperature (θ) and the coefficients of determination were all greater than 0.65 in every treatment. Temperature sensitivity coefficients (Q10) differed significantly among all water treatments, following the order of DI> CK>LD>HD.θ and Rs declined continuously during dry season and reached their minimum values in January. Significant differences among theθ values of all treatments were only found in winter. DI increased Rs while HD and LD decreased Rs. Stem growth remained stable until the middle of December, and decreased significantly since late December. Stem growth of DI and CK was significantly higher than those of HD and LD. The sapwood nitrogen content remained constant before December and started to decrease since December. Significant differences of the sapwood nitrogen contents among all treatments were found only in winter.Rs explained 56％ seasonal variation of stem growth. Sapwood nitrogen content explained 68％ seasonal variation of Rs.Ψpd explained 49％, 48％ and 63％ respectively seasonal variation of Rs, stem growth and sapwood nitrogen content.[Conclusion] Soil moisture content likely promotes the interaction of Rs, stem growth and sapwood nitrogen content by affecting Ψpd. DI increases Rs while drought decreases Rs. Theθ value and sapwood nitrogen content are affected by soil moisture content only in winter. In addition Rs may partially indicate the changes of heartwood formation.关键词
降香黄檀/心材/树干呼吸速率/氮含量/士壤含水量Key words
Dalbergia odorifera/heartwood/stem respiration rate/nitrogen content/soil moisture content分类
农业科技引用本文复制引用
崔之益,徐大平,杨曾奖,张宁南,刘小金,洪舟..土壤含水量对降香黄檀树干呼吸速率、生长和氮含量的影响[J].华南农业大学学报,2018,39(2):54-61,8.基金项目
国家重点研发计划项目(2016YFD060020503) （2016YFD060020503）
