Effects on rhizospheric and heterotrophic respiration of conversion from primary forest to secondary forest and plantations in northeast China
Effects on rhizospheric and heterotrophic respiration of conversion from primary forest to secondary forest and plantations in northeast China
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DOI：
10.1016/j.ejsobi.2014.11.003
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发表时间：
2015-01-01
影响因子：
4.2
通讯作者：
Jin, Guangze
中科院分区：
文献类型：
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作者：
Shi, Baoku;Gao, Weifeng;Jin, Guangze
为了评价森林转型对根际(R-R)和异养呼吸(R-H)的影响，采用开沟小区和红外气体交换分析仪对中国东北部4种温带森林类型的土壤呼吸(R-S)进行了划分，包括红松原始阔叶混交林、白桦次生林、兴安落叶松和红松人工林。结果表明，R-S及其组分表现出明显的季节动态，主要受土壤温度的控制。此外，在纯R-S(R-H)温度模型中加入土壤水分，提高了大多数森林类型的R-S和R-H的预测值(R-S，R-2=0.687-0.799；R-H，R-2=0.721-0.849)。在所有森林类型中，R-R(2.69-5.16)的表观温度敏感性(Q(10))均高于R-H(2.34-2.56)。天然白桦林、落叶松人工林和松林的平均R-H值分别提高了35%、31%和19%。表土有机碳储量的增加可以解释R-H值的增加。当原始林转变为桦树次生林时，平均R-R显著增加(P<；0.05)，但原始林和两个人工林的R-R没有显著差异(P>；0.05)。次生林和原始林以及两种人工林之间的R-R差异可能反映了小根生物量的差异(
To evaluate the effects of forest transition (conversion of primary temperate forest into secondary forest and plantations) on rhizospheric (R-R) and heterotrophic respiration (R-H), we used the trenching-plot and infrared gas exchange analyzer approaches to partition soil respiration (R-S) for four temperate forest types in northeast China, including the primary mixed broadleaved-Korean pine (Pinus koraiensis) forest, secondary birch (Betula platyphylla) forest, Dahurian larch (Lath gmelinii) plantation and Korean pine plantation, throughout the growing season (May October) in 2011 and 2012. The results showed that R-S and its components displayed obvious seasonal dynamics and were mainly controlled by soil temperature. Furthermore, incorporating soil moisture into the pure R-S (R-H)-tempetature model improved the prediction of R-S and R-H in most forest types (R-S, R-2 = 0.687-0.799; R-H, R-2 = 0.721-0.849). The apparent temperature sensitivity (Q(10)) of R-R (2.69-5.16) was higher than that of R-H (2.34-2.56) in all forest types. The average R-H was increased by 35% following the conversion of primary forest to secondary birch forest, 31% to larch plantation and 19% to pine plantation. Such increment of R-H could be explained by the increase of soil organic carbon storage in the top soil. When the primary forest was converted to secondary birch forest, the average R-R significantly increased (P < 0.05), but no significant differences in R-R between primary forest and two plantations were detected (P > 0.05). The differences in R-R between secondary birch forest and primary forest and two plantations may reflect differences in small root biomass (