Soil organic carbon （C） and total nitrogen （N） pools of a Chinese fir （Cunninghamia lanceolata （Lamb.） Hook.） （CF） forest, and an evergreen broadleaf （EB） forest located in mid-subtropical, southeastern Ch...Soil organic carbon （C） and total nitrogen （N） pools of a Chinese fir （Cunninghamia lanceolata （Lamb.） Hook.） （CF） forest, and an evergreen broadleaf （EB） forest located in mid-subtropical, southeastern China, were compared before clearcutting, with the effect of slash burning on organic C and total N in the top 10 cm of soil before and after burning also being evaluated. Prior to clearcutting CF forest had significantly lower （P 〈0.05） organic C and total N in the soil （0-100 cm） compared to EB forest with approximately 60% of the C and N at the two forest sites stored at the 0 to 40 cm soil. In post-burn samples of the 0-10 cm depth at 5 days, 1 year, and 5 years for CF and EB forests, significantly lower levels （P 〈0.05） of organic C and total N than those in the pre-burn samples were observed. Compared to the pre-burn levels, at post-burn year 5, surface soil organic C storage was only 85% in CF forest and 72% in EB forest, while total N storage was 77% for CF forest and 73% for EB forest. Slash burning caused marked long-term changes in surface soil C and N in the two forest types.展开更多
为了解雅鲁藏布大峡谷区域植物的生态适应性及N、P养分利用特征,该研究在墨脱不同森林植被区选取6个采样点,对每个采样点优势植物进行了植物叶片C、N、P化学计量特征分析。结果表明,研究区植物叶片碳含量均值为452 g kg^(-1),在不同采...为了解雅鲁藏布大峡谷区域植物的生态适应性及N、P养分利用特征,该研究在墨脱不同森林植被区选取6个采样点,对每个采样点优势植物进行了植物叶片C、N、P化学计量特征分析。结果表明,研究区植物叶片碳含量均值为452 g kg^(-1),在不同采样点之间差异未达到显著水平,其余指标在部分采样点之间则存在一定的差异;从生活型看,研究区木本植物叶片碳含量要高于草本植物,氮含量差异不显著,磷含量则低于草本植物;在不同采样点之间木本植物叶片碳氮磷含量差异不显著,木本植物碳氮差异也不显著,但草本植物部分采样点之间磷差异达到显著水平;相关性分析显示,植物叶片C与N、C与P相关性均不显著,但N、P相关性达到极显著水平;墨脱常绿阔叶林区植物叶片C含量略低于我国南方其它常绿阔叶林区植物叶片碳含量,氮含量略高于其他区域,但P含量显著高于其他区域的植物叶片P含量,因此C/N,C/P及N/P均较低,N/P的均值为11.4。本研究结果支持植物叶片氮磷在不同生境中均存在明显正相关关系,结合生长速率假说,墨脱常绿阔叶林区的植物生长速率可能远高于我国其他常绿阔叶林区,因此研究区森林生态系统的碳汇以及面对全球N沉降背景下的响应值得进一步研究。展开更多
基金Project supported by the National Natural Science Foundation of China (No. 30170770).
文摘Soil organic carbon （C） and total nitrogen （N） pools of a Chinese fir （Cunninghamia lanceolata （Lamb.） Hook.） （CF） forest, and an evergreen broadleaf （EB） forest located in mid-subtropical, southeastern China, were compared before clearcutting, with the effect of slash burning on organic C and total N in the top 10 cm of soil before and after burning also being evaluated. Prior to clearcutting CF forest had significantly lower （P 〈0.05） organic C and total N in the soil （0-100 cm） compared to EB forest with approximately 60% of the C and N at the two forest sites stored at the 0 to 40 cm soil. In post-burn samples of the 0-10 cm depth at 5 days, 1 year, and 5 years for CF and EB forests, significantly lower levels （P 〈0.05） of organic C and total N than those in the pre-burn samples were observed. Compared to the pre-burn levels, at post-burn year 5, surface soil organic C storage was only 85% in CF forest and 72% in EB forest, while total N storage was 77% for CF forest and 73% for EB forest. Slash burning caused marked long-term changes in surface soil C and N in the two forest types.
文摘为了解雅鲁藏布大峡谷区域植物的生态适应性及N、P养分利用特征,该研究在墨脱不同森林植被区选取6个采样点,对每个采样点优势植物进行了植物叶片C、N、P化学计量特征分析。结果表明,研究区植物叶片碳含量均值为452 g kg^(-1),在不同采样点之间差异未达到显著水平,其余指标在部分采样点之间则存在一定的差异;从生活型看,研究区木本植物叶片碳含量要高于草本植物,氮含量差异不显著,磷含量则低于草本植物;在不同采样点之间木本植物叶片碳氮磷含量差异不显著,木本植物碳氮差异也不显著,但草本植物部分采样点之间磷差异达到显著水平;相关性分析显示,植物叶片C与N、C与P相关性均不显著,但N、P相关性达到极显著水平;墨脱常绿阔叶林区植物叶片C含量略低于我国南方其它常绿阔叶林区植物叶片碳含量,氮含量略高于其他区域,但P含量显著高于其他区域的植物叶片P含量,因此C/N,C/P及N/P均较低,N/P的均值为11.4。本研究结果支持植物叶片氮磷在不同生境中均存在明显正相关关系,结合生长速率假说,墨脱常绿阔叶林区的植物生长速率可能远高于我国其他常绿阔叶林区,因此研究区森林生态系统的碳汇以及面对全球N沉降背景下的响应值得进一步研究。
