Distribution of soil carbon and nitrogen in two typical forests in the semiarid region of the Loess Plateau, China
Distribution of soil carbon and nitrogen in two typical forests in the semiarid region of the Loess Plateau, China
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黄土高原半干旱区两种典型森林土壤碳氮分布
DOI：
10.1016/j.catena.2016.04.004
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发表时间：
2016-08
期刊：
影响因子：
6.2
通讯作者：
Du S
中科院分区：
文献类型：
--
作者：
Song BL;Yan MJ;Hou H;Guan JH;Shi WY;Li GQ;Du S
黄土高原的森林生态系统因其在固碳和水土保持方面的特殊重要性而受到越来越多的关注。为了评估该地区两种典型森林的土壤碳和氮积累，我们对每种森林类型的三个近成熟林分进行了样地调查。采集不同深度0~200 cm土样，测定土壤有机碳(SOC)、无机碳(SIC)和全氮(STN)。结果表明，在表层土壤中，辽东栎林的土壤有机碳和全氮含量高于刺槐人工林，土壤重金属密度低于刺槐人工林。土壤有机碳和全氮含量均随土壤深度的增加而降低，在50 cm以下各林型间差异不显著。栎林土壤有机碳和固定态氮的总积累量大于刺槐人工林，尤其是表层土壤。结果表明，在表层土壤有机碳和氮素积累方面，栎林比人工林具有优势，两种类型的森林土壤都具有大量的碳汇作用。然而，在该地区的黄土土壤中，存在着相当大的碳化硅储量(深层碳储量是土壤有机碳的4-5倍)，土壤总碳(STC)的含量在两个生态系统之间没有明显差异。与常规的100 cm土层调查相比，在100~200 cm土层中，栎林中储存的SOC、STN和STC分别为0.45、0.49和0.91倍，而刺槐人工林中SOC、STN和STC则分别为0.65、0.65和1.01倍。厚黄土加上干旱的气候，可能是由于根系的发育以及土壤有机碳和土壤氮素向深层的分布。这表明深层土壤对碳的贡献相当大，在土壤碳估算中不应被忽略。
Forest ecosystems on the Loess Plateau are receiving increasing attention for their special importance in carbon sequestration and in the conservation of soil and water in the region. To evaluate soil carbon and nitrogen accumulation in two typical forests in the region, we conducted plot surveys in three near-mature stands for each forest type. Soil samples within 0–200 cm were collected from different depths, and the soil organic carbon (SOC), inorganic carbon (SIC), and total nitrogen (STN) were measured. The results indicate that the oak (Quercus liaotungensis) forests had greater SOC and STN contents and lower soil buck density than the black locust (Robinia pseudoacacia) plantations within top soil layers. Both SOC and STN contents decreased with soil depth, and the differences between the forest types became insignificant in layers beneath 50 cm. The total accumulations of SOC and STN were larger in the oak forests than in the black locust plantations, particularly in the upper soil layers. The results suggest that the oak forest has advantages over the plantation forest regarding SOC and nitrogen accumulation in the upper soil layer, and both types of forest soils have acted as substantial carbon sinks. However, in the loess soil in this region, there were considerable amounts of SIC storage (4–5 times of SOC in deep layers), and the amounts of soil total carbon (STC) did not differ obviously between the two ecosystems. Relative to the conventional soil survey of 100-cm depth, the SOC, STN and STC stored in 100–200 cm deep soil account for 0.45, 0.49 and 0.91 times in the oak forests, respectively, compared to 0.65, 0.65 and 1.01 times in the black locust plantations for SOC, STN and STC, respectively. Thick loess soil coupled with dry climate may be attributable to the development of root system and consequent SOC and STN distribution into deeper layer. This suggests that deep soil layers contribute considerable amounts and should not be omitted in soil carbon estimates.
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DOI：
10.5147/jswsm.v2i1.142
发表时间：
2014
期刊：
--
影响因子：
--
作者：
M. Iqbal;A. G. Khan;R. Mukhtar;S. Hussain
通讯作者：
M. Iqbal;A. G. Khan;R. Mukhtar;S. Hussain
影响因子：
6.2
作者：
Juan Zhang;Xiujun Wang;Jiaping Wang
通讯作者：
Juan Zhang;Xiujun Wang;Jiaping Wang
影响因子：
4
作者：
P. Vitousek;R. Howarth
通讯作者：
P. Vitousek;R. Howarth
影响因子：
2.3
作者：
Yafeng Wang;B. Fu;Y. Lü;Chengjun Song;Yong Luan
通讯作者：
Yafeng Wang;B. Fu;Y. Lü;Chengjun Song;Yong Luan
影响因子：
56.9
作者：
DIXON, RK;BROWN, S;WISNIEWSKI, J
通讯作者：
WISNIEWSKI, J