کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
4389898 | 1618049 | 2012 | 7 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Arrival vs. retention of seeds in bare patches in the semi-arid desertified grassland of Inner Mongolia, northeastern China
دانلود مقاله + سفارش ترجمه
دانلود مقاله ISI انگلیسی
رایگان برای ایرانیان
کلمات کلیدی
موضوعات مرتبط
علوم زیستی و بیوفناوری
علوم کشاورزی و بیولوژیک
بوم شناسی، تکامل، رفتار و سامانه شناسی
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
Seed availability is critical for vegetation restoration of bare patches in desertified grassland. Many studies explain seed availability by seed arrival or retention, however, no conclusions are universally applicable. Eleven bare patches, ranging from 80 m2 to 500 m2, were selected in semi-arid desertified grassland of Inner Mongolia in northeastern China to determine the retained seed:arrived seed ratio and factors (in both seed morphology and patch characteristics) regulating the ratio. From May to August (the germination season), the arrived seeds were more than 208 (grains mâ2); the retained ones were less than 93 (grains mâ2). From September to November (part of the non-germination season), the arrived or retained seeds were nearly equal to those during May to August (P > 0.05). The retained seed:arrived seed ratio was generally less than 20% each season. Seed shape and appendage as well as vegetation cover of bare patches explained 64% of seed retention, but seed mass and patch size explained little. Our study indicated that bare patches in the desertified grassland lacked seeds because of low seed retention and arrival of seed at inopportune times.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Ecological Engineering - Volume 49, December 2012, Pages 153-159
Journal: Ecological Engineering - Volume 49, December 2012, Pages 153-159
نویسندگان
Zhimin Liu, Jinlei Zhu, Xu Deng,