Distribution and Seasonal Dynamics of Roots in a Revegetated Stand of Artemisia ordosica Kracsh. in the Tengger Desert (North China)
Distribution and Seasonal Dynamics of Roots in a Revegetated Stand of Artemisia ordosica Kracsh. in the Tengger Desert (North China)
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DOI：
10.1080/15324980802182980
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发表时间：
2008-07
影响因子：
1.4
通讯作者：
Zhishan Zhang;Xin‐rong Li;Tao Wang;Xin‐ping Wang;Q. Xue;Li-chao Liu
中科院分区：
文献类型：
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作者：
Zhishan Zhang;Xin‐rong Li;Tao Wang;Xin‐ping Wang;Q. Xue;Li-chao Liu
在重植的沙漠地区，根系对植物生长和群落稳定至关重要。本文通过野外调查研究了油蒿（Artemisia ordosica Kracsh）复植林根系的分布和动态。在2004年和2005年的生长季节腾格里沙漠。在茎部周围挖7个宽1.2 m、深1.0 m的沟，测定粗根长度和重。设计与茎相距0.2、0.4、0.6、0.8和1.0 m的土芯采集细根样本，并在距茎0.2、0.5和1.0 m的间隔处埋设微型植管，测量细根数量和长度。结果表明：油松根系垂直分布于最上层土壤剖面，粗根分布最明显，集中在0.2 m土壤剖面；油麻粗根的根长和根重水平分布分别限制在距树干0.6 m和0.4 m的范围内。细根比粗根分布均匀。总根生物量为0.42 kg m−2，细根生物量为0.26 kg m−2，分别占总生物量的80%和50%左右。细根的生长和分布主要与土壤含水量有关。土壤含水量和细根长均在2004年和2005年达到峰值。土壤含水量的峰值比细根长度密度的峰值早1个月。1个月后，土壤体积含水量达到2.75%，细根丰富。
In revegetated desert areas, roots are critical for plant growth and community stability. A field study was conducted to investigate the distribution and dynamics of roots in a revegetated stand of Artemisia ordosica Kracsh. in the Tengger Desert during the growing seasons of 2004 and 2005. Seven trenches 1.2 m wide and 1.0 m deep were excavated around stems to determine the coarse root length and weight. Soil cores, spaced from the stem at an interval of 0.2, 0.4, 0.6, 0.8, and 1.0 m, were designed to take fine root samples, and minirhizotrons were buried at intervals of 0.2, 0.5, and 1.0 m away from the stem to measure the fine root number and length. The results showed that the root systems of A. ordosica is distributed vertically in the uppermost soil profile, especially for coarse roots, which were concentrated in the 0.2-m soil profile. The horizontal distribution of A. ordosica coarse roots was limited to a range of 0.6 m and 0.4 m away from the trunk for root length and weight, respectively. Fine roots were distributed uniformly in comparison with coarse roots. The total root biomass and fine root biomass were 0.42 and 0.26 kg m−2, which accounted for about 80% and 50% of the total biomass, respectively. The growth and distribution of fine roots were mainly related to soil water content. Peak values in both soil water content and fine root length were observed twice, in 2004 and 2005. The peak value of soil water content was observed 1 month prior to that of fine root length density. The fine roots were abundant 1 month later, when the volumetric soil water content reached 2.75%.