The influence of stocking levels,clone,fertilization,and weed control on surface C02 efflux in a mid-rotation Pinus radiata D.Don plantation in Canterbury,New Zealand

• 作者: Mohan KC Euan G.Mason Horacio E.Bown
• 来源期刊: 林业研究（英文版）
• 年，卷（期）: 2021,（6）
• 所属期刊栏目: ORIGINAL PAPERS
• 页码范围: 2567-2575
• 页数: 9页
• 语种: 英文

摘要

Silvicultural practices applied in managed for-est plantations may help counteract the effects of climate change by influencing soil surface C02 efflux(Fs).Under-standing the effects of silvicultural practices on Fs will pro-vide unbiased estimates of carbon fluxes and allow better silvicultural decisions for carbon sequestration.Therefore,we assessed how Fs differed seasonally across silvicultural practices(i.e.,stocking levels,clone,fertilization and weed control treatments)and evaluated the effects of soil tempera-ture(Ts)and soil volumetric water content(θV)on Fs across these practices for a mid-rotation(14 year-old)Pinus radiata plantation in the Canterbury region of New Zealand.There were significant differences in Fs(p＜0.05)over the four seasons,three levels of stocking,and five clones.The effects of fertilization and weed control applied 12 years previously on Fs were insignificant.Annual estimate of Fs(mean±1 standard deviation)from the study site was 22.7±7.1t ha-1 a-1 in the form of CO2(6.2±2.1 t ha-1 a-1 in the form of C).Fs values were consistently higher in plots with 1250 stems ha-1 compared to 2500 stems ha-1,which may be related to a strong soil resource limitation because of the close spacing in the latter plantation.Significant differences in Fs across clones suggest that variations in carbon partitioning might explain their growth performance.Silvicultural treatments influenced Fs response to soil temperature(p＜0.05),result-ing in models explaining 28-49％of the total variance in Fs.These findings provide insights into how silvicultural management decisions may impact Fs in mid-rotation radiata pine plantations,contributing towards developing more pre-cise and unbiased plantation carbon budgets.