宁夏大学 西北退化生态系统恢复与重建教育部重点实验室,宁夏,银川,750021
纸质出版:2014
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YANG Yang, LIU Bing-ru, YANG Xin-guo, et al. Soil Stoichiometry Characteristics of Artificial Caragana Korshinskii Shrubs with Different Density in Desert Steppe[J]. Bulletin of Soiland Water Conservation, 2014, 33(5): 67-73.
杨阳, 刘秉儒, 杨新国, 等. 荒漠草原中不同密度人工柠条灌丛土壤化学计量特征[J]. 水土保持通报, 2014,33(5):67-73. DOI: 10.13961/j.cnki.stbctb.2014.05.019.
YANG Yang, LIU Bing-ru, YANG Xin-guo, et al. Soil Stoichiometry Characteristics of Artificial Caragana Korshinskii Shrubs with Different Density in Desert Steppe[J]. Bulletin of Soiland Water Conservation, 2014, 33(5): 67-73. DOI: 10.13961/j.cnki.stbctb.2014.05.019.
为了揭示人工灌草结合的生态系统土壤内部C
N
P平衡和循环过程
以荒漠草原为对照(CK)
研究了相同林龄不同密度(高密度HD、中密度MD、低密度LD)人工柠条灌丛土壤化学计量特征。结果表明
柠条灌丛0-100 cm土层平均有机碳(SOC)、全氮(TN)
全磷(TP)和氮磷比(N/P)随密度的增加呈上升趋势
碳氮比(C/N)
碳磷比(C/P)呈降低趋势
其中TP的空间变异性较高;垂直方向SOC
C/N和C/P随土层深度的增加呈单峰曲线
TN
TP和N/P在0-40 cm土层呈锐减趋势
40 cm土层以下缓慢降低并趋于稳定;0-40 cm土层TN和TP含量占总含量的61.82%和55.56%
可作为密度变化对人工柠条灌丛土壤养分的敏感指标;相关分析结果发现
人工柠条灌丛土壤N和P含量呈极显著正相关(p<0.01)
二者均与C/N呈极显著的负相关(p<0.01)
说明柠条对土壤中N和P两种元素需求相一致。
Taking the natural desert steppe as CK
soil stoichiometry characteristics of artificial Caragana korshinskii shrubs with different density(HD
MD
LD) of the same forest age were investigated to reveal soil C
N
P balance and internal circulation in artificial shrub-grass ecological system. The results showed that with the increase of the density
soil organic carbon(SOC)
total nitrogen(TN)
total phosphorus(TP) and ratio of nitrogen to phosphorus(N/P) in 0-100 cm presented an increase trend
while the ratio of carbon to nitrogen(C/N) and carbon to phoshorus(C/P) presented a decrease trend
and the variation coefficient of TP was higher than other soil stoichiometry; Vertical direction SOC
C/N and C/P showed unimodal curve with the increase of soil depth
while TN
TP and N/P showed a sharply decrease trend in 0-40 cm soil layer with the increase of soil depth
but in 40-100 cm soil layer showed a slow decrease and tended to be stable. In 0-40 cm soil
TN and TP accounted for 61.82% and 55.56% of total content
and the content of TN and TP soil could be used as artificial C. microphylla shrubs sensitive index of soil nutrients; Correlation analysis showed that N content was positively linearly correlated with P content(p<0.01)
and both was significantly negative correlated with C/N(p<0.01)
and indicates consistent demand of N and P content in soil for C. microphylla shrubs.
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