[FIGURE 1 OMITTED]Patterns of tissu

[FIGURE 1 OMITTED]

Patterns of tissue N and P concentrations in response to N and P contents in the soil in field N and P addition experiment

Changes of tissue N and P concentrations in response to soil N and P contents (soil inorganic N varied from 8.2 to 68 and 8.8 to 103 mg [kg.sup.-1] in 2006 and 2007, respectively, and available P varied from 2.1 to 22.7 and 2.2 to 23.5 mg [kg.sup.-1]) in the field N and P addition experiments were similar to those in the sand culture experiment. On average, the homeostasis model explained 80 [+ or -] 17% (mean [+ or -] SD) of the variation in plant elemental composition for the three plant species (77 [+ or -] 13% for the 12 species; Yu et al. 2010). H ranged from 2.60 to 9.45 (Fig. 2) with an average of 5.42 [+ or -] 2.44.

[FIGURE 2 OMITTED]

Aboveground H values of Leymus chinensis were the highest among the 12 species in the field experiment. HN, [H.sub.N:P(+N),] [H.sub.P], and [H.sub.N:P(+P)] in 2007 were 7.68 (N varying from 2.01 to 2.91%), 10.29,5.6 (P varying from 0.10 to 0.18%), and 6.15, respectively (Fig. 2). H values of Chenopodium glaucum were the lowest among the 12 species. [H.sub.N], [H.sub.N:P(+N)], [H.sub.P] and [H.sub.N:P(+P)] in 2007 were 3.54 (N varying from 2.31 to 4.67%), 3.87, 2.88 (P varying from 0.20 to 0.48%), and 3.15, respectively. There were no significant differences between the results from 2006 and 2007. H values for the other species were within the range of Leymus chinensis and Chenopodium glaucum. The order of H values for plant functional groups was PR > PB > PF > AB(Fig. 4). Within a given functional group, H values of species were similar.

Hasil (Bahasa Indonesia) 2:

[GAMBAR 1 dihilangkan]

Pola jaringan N dan P konsentrasi dalam menanggapi N dan P isi di dalam tanah di lapangan N dan penambahan P percobaan

Perubahan jaringan N dan P konsentrasi dalam menanggapi tanah N dan P isinya (anorganik tanah N bervariasi dari 8,2-68 dan 8,8-103 mg [kg.sup.-1] pada tahun 2006 dan 2007, masing-masing, dan P tersedia bervariasi 2,1-22,7 dan 2,2-23,5 mg [kg.sup.-1]) di bidang N dan P percobaan Selain itu mirip dengan yang di percobaan budaya pasir. Rata-rata, model homeostasis menjelaskan 80 [+ atau -] 17% (mean [+ atau -] SD) dari variasi dalam komposisi unsur tanaman untuk spesies tanaman tiga (77 [+ atau -] 13% untuk 12 spesies; Yu et al. 2010). H berkisar 2,60-9,45 (Gambar 2.) Dengan rata-rata 5,42 [+ atau -]. 2.44

[Gambar 2 dihilangkan]

di atas permukaan tanah H nilai Leymus chinensis merupakan yang tertinggi di antara 12 spesies dalam percobaan lapangan. HN, [H.sub.N: P (+ N),] [H.sub.P], dan [H.sub.N: P (+ P)] pada tahun 2007 adalah 7,68 (N bervariasi 2,01-2,91% ), 10.29,5.6 bervariasi 0,10-0,18% (P), dan 6,15, masing-masing (Gambar. 2). Nilai H dari Chenopodium glaucum adalah yang terendah di antara 12 spesies. [H.sub.N], [H.sub.N: P (+ N)], [H.sub.P] dan [H.sub.N: P (+ P)] pada tahun 2007 adalah 3,54 (N bervariasi 2,31-4,67%), 3,87, 2,88 (bervariasi 0,20-0,48% P), dan 3,15, masing-masing. Tidak ada perbedaan yang signifikan antara hasil dari 2006 dan 2007. nilai H untuk spesies lain berada dalam kisaran Leymus chinensis dan Chenopodium glaucum. Urutan nilai H untuk kelompok fungsional tanaman adalah PR> PB> PF> AB (Gambar. 4). Dalam suatu kelompok fungsional yang diberikan, nilai-nilai H spesies yang sama.